Boat tour
Boat tours are a service provided by Kapp'n in Animal Crossing: New Horizons beginning in version 2.0. Once per day, the player can pay 
1,000 Nook Miles to Kapp'n at the island's pier to travel to a random deserted island, similar to a Mystery Island Tour. Each boat tour island has one Gyroid Fragment buried on it. Uncommonly, islands may have money trees or money rocks on them.
If the player has not been to a Gyroid, Vegetable, or Glowing Moss type island within the last 7 boat tours and none of the other island types are chosen for that day, the island visited will be of one of those four types that has not been visited. If there are multiple, the type visited the longest time ago is selected.
Certain islands exist in a different season or time of day from the game clock. This can be taken advantage of to catch out-of-season fish, insects, and sea creatures. Time still continues to pass on these islands, which can be observed if the player spends several hours on one.
Probability
The game first determines if the player will visit a normal island (78%) or a rare island (22%). If the player has received a fortune for improved belongings luck that day, this is always guaranteed to be a rare island.[1] Otherwise, the game will calculate this as follows:
- If a normal island is chosen, the game will select a normal island type from the ones that haven't been visited in the longest time within the last 7 days. The counter for not visiting a particular island can increase to a maximum of 20 days.
- If a rare island is chosen, a rare island type will be chosen at random.
- If a specific player has not yet personally experienced the date on their own island that the selected island currently experiences, the game will instead select a normal island. This is always guaranteed to be the archipelago-style island if the player has received a fortune for improved belongings luck that day.
Common factors
All islands contain a single buried Gyroid Fragment.
Most islands contain fruit trees, which will always bear the player's native fruit, but none of them will ever contain any Bells, items, or Wasps. There is a 5% chance for trees to spawn as money trees, with each bag containing 
1,000 Bells.
Flowers will always be in-season according to the date experienced on the island, but will never be the player's native or sister flowers. The bushes present on the island are always the current bushes in bloom as determined by the game's time.
Bug and fish spawns will always match the date that the island is experiencing (either fixed or real in-game time).
For normal islands, there is a 29.4% chance of one of the rocks being a money rock, and a 2% chance of all rocks being money rocks. Rare islands will always have at least one money rock present.
Types of islands
- Note that all island names are conjectural unless otherwise stated.
Normal islands
Normal islands all have multiple possible layouts, one of which will be chosen at random when the player visits an island type.
Gyroid islands
Chance: 30%
Internal IDHaniwa/RareHaniwa
Date
Game time
Weather pattern
Fine00
Rain04 (on rare occasions)
Rocks
×3 regular
Buried items
×1 Gyroid Fragment
×1 gyroid (random; on rare occasions)
Ground materials
×5 Tree Branch
DIY recipe type
Standard
These islands are encountered most frequently between all island types. This type of island is always guaranteed to be visited upon the player's first boat tour, when searching for Brewster, and whenever the player has received a bad belongings fortune from Katrina (and has not opted for purification). In this latter scenario, the buried Gyroid Fragment will always be replaced with Clay.
There's an 8% chance that the player may encounter the same island but with precipitation (either rain or snow depending on the time of year). In addition to the usual buried Gyroid Fragment, there will be one fully-formed gyroid buried as well. This can be any gyroid except for a Brewstoid.
- Maps
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- Screenshots (Gyroid islands)
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- Screenshots (Rare Gyroid islands)
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Vegetable islands
Rocks
×4 regular Buried items
×1 Gyroid Fragment
Ground materials
×5 Tree Branch DIY recipe type
Cooking
These islands contain multiple plants of one random type of vegetable, with each plant containing a fixed amount of harvestable produce. The message bottle that appears on the beach always contains a random cooking recipe.
- Maps
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- Screenshots
Vine/glowing moss islands
These islands contain Vines and Glowing Moss. The message bottle that appears on the beach always contains a random vine or glowing moss recipe.
If the player has received a good belongings fortune from Katrina, the player will be sent to this island if the rare island the game rolls to hasn't been unlocked by the player.
- Maps
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- Screenshots
Rare islands
Rare islands all have a single fixed layout for each island type.
Star Fragment
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Rocks
×2 star fragment Buried items
×1 Gyroid Fragment
Ground materials
×3 Tree Branch, ×3 Star Fragment,
×1 Large Star Fragment DIY recipe type
Stars
This island is always set to midnight when the player arrives, with a heavy meteor shower taking place. If the player wishes upon the shooting stars, star fragments will appear on their own island's beaches the following day. The message bottle that appears on the beach always contains a random star fragment recipe.
The meteor shower on this island is heavier than what the player can ever experience on their own island, with an 80% chance of a shooting star appearing on any given minute instead of the usual 50%. There is then an equal chance for 5 stars or 8 stars to appear within that single minute.
Rocks on this island will always drop only star fragments with the following distribution:
Cherry Blossom
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Rocks
×2 regular, ×1 money Buried items
×1 Gyroid Fragment
Ground materials
×5 Tree Branch, ×3 Stone DIY recipe type
Cherry Blossom seasonal
This island is always experiencing the spring Cherry Blossom season, with all hardwood trees taking on soft pink petals and Cherry-Blossom Petals floating in the air that can be caught with a Net. The message bottle that appears on the beach always contains a random recipe from the Cherry Blossoms Series.
The island can only be visited if the player has played the game between April 1 and 10 in the Northern Hemisphere, or October 1 and 10 in the Southern Hemisphere.
Spring Bamboo
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Rocks
×2 regular, ×1 money Buried items
×1 Gyroid Fragment, ×5 Bamboo Shoot
This island is always experiencing spring and contains bamboo, which can drop Young Spring Bamboo when struck with an axe. The message bottle that appears on the beach contains a random recipe from the Bamboo Series.
The island can only be visited if the player has played the game between February 25 and May 31 in the Northern Hemisphere, or August 25 and November 30 in the Southern Hemisphere.
Summer Shell
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Rocks
×2 regular, ×1 money Buried items
×1 Gyroid Fragment
Ground materials
×5 Tree Branch, ×3 Stone, ×7 Summer Shell DIY recipe type
Summer Shell seasonal
This island is always experiencing summer, with Summer Shells found washed ashore on the beaches. The message bottle that appears on the beach always contains a random recipe for an item crafted using Summer Shells.
The island can only be visited if the player has played the game between June 1 and August 31 in the Northern Hemisphere, or December 1 and February 28 in the Southern Hemisphere.
Mushroom
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Rocks
×2 regular, ×1 money Buried items
×1 Gyroid Fragment
Ground materials
×5 Tree Branch, ×3 Stone
mushrooms, acorns, pinecones DIY recipe type
Mushroom seasonal
This island is always experiencing fall and is host to various species of mushrooms. The message bottle that appears on the beach always contains a random recipe from the Mush Series. A random assortment of six mushrooms (composed of two Flat Mushrooms, Round Mushrooms, and Skinny Mushrooms) can be found, as well as Pine Cones and Acorns.
In order, each of the 15 trees will be randomly assigned an item underneath:
- Three trees will have a Tree Branch.
- Five trees will have a random mushroom.
- Up to five Hardwood trees (or less if there are less than five Hardwood Trees) will have an Acorn.
- Up to five Cedar trees (or less if there are less than five Cedar Trees) will have a Pine Cone.
The island can only be visited if the player has played the game between November 1 and 30 in the Northern Hemisphere, or May 1 and 31 in the Southern Hemisphere.
Maple Leaf
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Rocks
×2 regular, ×1 money Buried items
×1 Gyroid Fragment
Ground materials
×5 Tree Branch, ×3 Stone, ×6 Acorn DIY recipe type
Maple Leaf seasonal
This island is always experiencing fall and has Maple Leaf floating in the air, which can be caught using a Net. The message bottle that appears on the beach always contains a random recipe from the Tree's Bounty or Leaves Series.
The island can only be visited if the player has played the game between November 16 and 25 in the Northern Hemisphere, or May 16 and 25 in the Southern Hemisphere.
Snowflake
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Rocks
×2 regular, ×1 money Buried items
×1 Gyroid Fragment
Ground materials
×5 Tree Branch, ×3 Stone DIY recipe type
Snowflake seasonal
This island is always experiencing a snow storm during winter and has snowflakes floating in the air, which can be caught using a Net. The message bottle that appears on the beach contains a random recipe from the Frozen Series.
The island can only be visited if the player has played the game between December 11 and February 24 in the Northern Hemisphere, or June 11 and August 24 in the Southern Hemisphere.
References
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