I'm not afraid of heights. I'm happy to jump waterfalls and do the occasional bridge-swing. But this kind of "fun", on the other hand, is just no fun for me. I mean, does anyone actually enjoy feeling nauseous, and does anyone like turning a paler shade of green?
Kids generally just love this kind of thing, but I remember not really being too perturbed as a kid that my friends got to go on all the rides. I was pretty much content to watch them having fun, from a safe distance.