Lots of fun stuff in Santa Fe
RTA Contributor Dennis Goza just posted a nice article about Downtown Santa Fe in the Roadtrip Attractions section. At the end he includes a few links, including santafe.org. That would be a good place to start looking for thing to do.
One place I'd like to point out is El Rancho de las Golondrinas, a living history museum at the south end of town. They’re only open during the summer, and not every single day, so make sure that they are open before you go out there.
A few restaurants that I'd recommend are:
La Choza
The Pantry [been here for breakfast a few times - really like it]
Santa Fe Bite at Garrett’s Desert Inn [operated by the folks who used to run the old Bobcat Bite]