I'm going to give this a shot when I stop in St. Thomas (and take ferry over to St. John). It's $79 for a small group at Coral World Ocean Park...
"Experience a coral reef from the intimate perspective of a diver without the need for certification. This SNUBA tour keeps you connected to an air supply on the surface, so you can explore the vibrant reef and discover amazing aquatic life with complete freedom."
Anybody else have any experience with SNUBA diving?