When you buy a new theme park on a new island you can’t go back to the previous one, since you sold it in order to manage a better one.

You have to start from scratch, but now you will have a faster flow of money thanks to higher multipliers.

Your previous rides and in-game features will be recovered in a short time, and you will be able to advance further in the game.

You can see all the islands available and their prices by tapping on the island icon (second of the upper-right corner icons).