Thanks Cathy,
I guess we're looking mostly at nature/outdoorsy with a bit of museum/activity type things as well.
I had the Camping trip planned (yes for the SW not SE - my mistake) for the parks that you mentioned - so much to do - so little time. Do you think it would be too cold in a camper?
I have seen the GCanyon from the southern rim so was thinking maybe the northern rim - via the Indian reservation!? My DS and mom haven't seen anything so it will all be new to them.
I guess one of my main ideas for camping was that it would give DS a chance to interact with other children. Then I was thinking there may not be many other campers at that time of year.
Have you seen Montezuma's Castle (I think that's what its called)? Is it worth a trip?