I wasn't sure where to find that information here on the "DIS" but at AllEars.net it says....
Rental watercraft at Fort Wilderness Marina (open 10 a.m. to 5 p.m. daily) including: 21' Suntracker pontoons ($34.74/half hr), must be 18 to drive; Mercury Water Mice ($21.59/half hour; $27.23/45 minutes; $30.05/one hour), must be 12 and 5 feet tall to drive. Parent or guardian signature required for all drivers 12-18 years old. At the Bike Barn: canoes, kayaks and paddle boats ($6.13 plus tax/1/2 hour; $10.38 plus tax/hour) (Prices are estimates, call the Bike Barn at (407) 824-2742 for current pricing.)
Water skiing, wakeboarding - starting at $140/hour with a 5-guest maximum
Carol/Wunderwoman