I'm planning on taking a trip form San Diego to Tucson the end of Sept. (27-29th) to visit the Pima air Museum, Titan museum and Davis Monthan AFB to look at the old planes etc. I was also going to hit Colossal caves and Karchner Caverns while I was there. I'm a pretty high speed low drag tourist and was thinking I would do the museums the first day and the caverns while enroute to Tombstone (last minute addition). Are there any other must see/do things out there that I'm missing? Are the caverns/caves worth the trip or should I blow them off for Tombstone? I planned on camping unless it's still unbearably hot....Any help or suggestions would be appreciated.