Go on and under water with the Seabreacher Dolphin Boat.
Speed: 35-40 mph on the surface, and up to 20mph under water.
Dive about 5 feet for brief durations but generally they go just a few feet below the surface in order to keep the snorkel above the water.
Price: between 48,000 and 68,000 dollars.
Buy one on their Website: www.seabreacher.com