While not battling, Skylanders can help run various facilities in the island, such as mines for gems and gold and training buildings for higher XP yield. The two main buildings other than the Academy are the Spring of Souls, where Soul Stones and various items can be obtained for gems and Wish Stones, and a store to exchange currency for a variety of necessities.
Gallery
Island with capped out buildings, as of the beta.
Trivia
The island serves the same role as the Skylands and the Lost Islands in previous spin-offs, being a customizable headquarters for the Portal Master player.
In the game's final release, the Sky Island can also be customized with decorations, like its predecessors.