They also have a length of stay plan. We used it this past August for an eleven day stay. It worked out great. You can put up to five drivers names on the list, those are the only ones allowed to drive the boats. But you can also have passengers. It worked out well as we had ten people in our group, 8 adults and 2 kids. With tax I believe the total was $212, but we used the boats so much. If we had paid the per use fee it would have been well over $500. The plan allows you to take out the two person watermice (which are a blast!), the four seater canopy boat, and the ten person pontoon boats.
I believe if you do this at Ft. Wilderness or Wilderness Lodge, it also includes use of bikes. Contemporary does not have the bikes.
We were even able to have a picnic on the pontoon boat while we were overlooking the Magic Kingdom. Very nice!