Treasure Island is the main location in Five Nights at Treasure Island. Your job is to survive the Suits and Humanoids that come to life for five nights while the SSA pack up and head to your location. It is very unorganized.
In real life, it is located in Baker's Bay, Bahamas, according to the creepypasta, but is actually located in Bay Lake, and used to be a resort, until it was recognized as a zoological park and its name was changed to "Discovery Island". The park was later closed in 1999 and moved to Animal Kingdom.