Would have to agree with FFF re Tucson. Very GA friendly, and shares runways with F16's, B2's and things too.
PIMA Air and Space Museum is a must. You can get a joint ticket for the boneyard and the museum and just hop on the next bus from the museum entrance - then go back in the museum after. Most of the aircraft are outside, so take a hat... And don't forget to poke around the hangers on the outskirts full of old warbirds and things. Not a lot make it to some of the more distant corners of a big site, and there are plenty of interesting old boys manning the info desks who are glad someone's made the effort to get to see their pride and joys.
Also make a point of overflying the boneyard on your departure. Just call up Davis Montham Tower and request an overfly - amazing how happy they are to give you a clearance at a few hundred feet.
TMC