Has anybody here traveled among the more notorious national parks and come away with thoughts about the merits of visiting them? I've got a week off in May and I'm thinking about going to one or two to get some much needed outdoor time. I guess I'm not even sure what all there is to do to occupy time. I'm not much of a camper or hiker, but open to anything. The less physically intensive the better. Fishing? Bird watching? Geysers? What goes on at these places and when is the time to visit them?