Have anyone done the shore excursion called See Nassau the Fun Way on a Segway? If so did you book through carnival or did you book directly on the island. It is only 2 hours. Was it fun?
Not sure if you have experience from Segways. If not, I don't either. But I've talked to people who own them and while they aren't hard to use, they take a bit of getting used to. You might have to spend some of the excursion time just learning the ropes of them if you haven't been on one before...I bet they are fun though.
Carnival Holiday (1999 ?)
RCI Sovereign of the Seas 2007
RCI Enchantment of the Seas 2009