Sue,
I think FP is a different vacation for those who snorkel, those who dive and those who don't. If you don't like water activities, you are fair skinned and don't want to be outside in the sunshine or tropical atmosphere, then FP may not be for you. We snorkel and love being out in the water.
I am guessing that you have taken the kids to Hawaii so think of it as Hawaii on steriods.
We also like to walk around places just to see things. I don't think that would be what kids want to do particularly. I think there is a lot to see there - the 4x4 will be fun.