Animal Crossing: New Horizons/Mystery Islands

Mystery islands are various stylized islands that you can arrive to using. Each Nook Mile Ticket cost 2,000 Nook Miles and are obtained through Nook Stop.

Each mystery island features a, palm trees with coconuts, either the player's native flower or sister flower, hardwood trees or cedar trees, fruit trees, and an occasional message bottle or fossils, both of which have a 30% of appearing on one mystery island. A mystery island may also have the possibility to spawn a villager. Villagers are selected first by their species, then by their members. In this case, one of the three villagers are more common to appear than one  villager.

All mystery island types
There are 20 different island combinations, with two islands being removed and unused since.