Boracay is known to most of us
I just found a mathematical one:
The Crooked House of Seifert Surface
Boggle your mind as you bounce around this Möbius strip of interconnected rooms. The loopy structure was inspired by Robert A. Heinlein’s short story about a four-dimensional hypercube.
Also visit the Sculpture Garden in this "Future" world. You can find it by entering the transport tubes, or fly to Grand Central Station and take the tube from there.
These also look interesting:
International Spaceflight Museum
Come visit an island bristling with scale replicas of rockets from the dawn of the Space Age to the present day. There are also regular lectures and demonstrations, and a bitchin’ planetarium.
Svarga
It’s not just an island paradise: It’s also an experiment in ecosystems, with clouds, plants, bees, and birds all interacting in a circle of virtual life.