Nautilus Undersea Suite at The Poseidon Resort, Fiji. Normally I don't post stuff like this, but wow. this is officially my dream vacation spot. I could spend hours lying in bed watching the fish swim by!
Senegal's Lake Retba, or as the French refer to it Lac Rose: harmless halophilic bacteria make the water pink. Lake Retba has a high salt content, much like that of the Dead Sea, allowing people to float effortlessly in the massive pink water.