Tubac, Arizona is a cute little town about 40 miles south of Tucson and it makes a great daytrip if you're looking for an excuse to see the countryside of the Santa Cruz River Valley that runs to the Mexican border. The landscape leading to Tubac is broad and mysterious and you can feel the ghosts of Apaches riding the high ridges to the east as you head south. It's quite a mysterioius area and, so far at least, is relatively undeveloped.
Tubac itself is an artist's colony and there are more than 90 shops and galleries (hard to believe since the town is so tiny) and several nice places to eat. The thing to do in Tubac is just park the car and wander around looking at Mexican pottery, tin sculptures, garden ornaments, etc. Tubac (unlike its grotesque and horrifically overdeveloped northern cousin, Sedona) doesn't take itself too seriously and the artists that live and sell their wares there seem geninuinely involved in their work. So if you like shopping, talking with artists and just generally relaxing in a beautiful desert setting, you'll love Tubac.