Maldives is the ultimate island destination. Many resorts are their own islands and feature personal cabanas attached by plank walkways over the water. See the famous bioluminescent phytoplankton beaches on Vaadhoo Island at night that look like an ocean
Christ of the Abyss is a 8 foot, 4000 pound bronze sculpture of Jesus that stands in 25 feet of water off of Key Largo, Florida. It is one of the most famous and popular underwater sites in the only underwater park in the world.
The "Leap of Faith" at Atlantis Bahamas. tall and long, from the top of the Ziggurat, the "Leap of Faith" catapults riders into a transparent tunnel and through a shark-filled lagoon. Except I have major problems with tunnel water slides.