You spawn in what seams to be just an other jungle biome but when you walk around you realize your on an island. the island is about 25% trees and that is split on the east side of the island. There are no caves or anything special other then just the island being so cool.
P.S i set a challenge to anyone on hardcore mode to build the best beach house on the island; please email me the results at email@example.com.
“-1 (large biomes)”