When we were kids, we had a piece of plywood shaped a bit like that, that we would ride on standing up. It was tied to the boat and front of the board and had ski handle and short rope tied to the hole in the front to hang on to. I remember it being great fun.
Wonder if that would work in this?? My knees wont let me ride a kneeboard anymore. The g-kids would love it.
I have a great Joker kneeboard just collecting dust now.