Without a doubt, the most popular rental is the two-passenger Water Mouse. A small speedboat, these are a lot of fun and feel like they go faster than they actually do. Drivers must be at least 12 years old and be at least five feet tall, and there is a weight limit (which I believe is 250 or 300 pounds). They will not allow an adult and 2 small children - each boat is allowed either one person or two people, without exception. The higher the weight, the slower the boat, so I would recommend two adults or teens each get their own Water Mouse if they want to have the most fun.. These rent for $22 (including tax) for 30 minutes, and everyone must wear a life jacket.