Don't know exactly when you'll be there, but the Cumbres and Toltec RR is offering a
Geology Train June 19th. Even if you can't make the geology train, the train trip itself is sure worth the time from Santa Fe.
Four Corners, Wupatki, Sunset Crater are all more than just a day trip from SF. Closer in, you might find a long day trip to El Malpais and El Morro worth your time. There are lava tubes nearby, but I don't know their current status. Bandelier NM would be closer yet. Like geology? Head NE up to Capulin Volcano NM. On the way, check out Las Vegas, NM. Many old buildings still around town, as Las Vegas never underwent the urban renewal craze of the 1960's and 1970's. If you get to Las Vegas early, eat breakfast at Charlie's Bakery (used to be Charlie's Spic and Span). Or stop there on the way back home. Really good NM fare.
Ken & Allison
2 Camping Cats (1 diabetic)
1996 4Runner, TRD Supercharger, Edelbrock headers
2007 Fleetwood Arcadia, Honda EU2000i
4 mountain bikes, 1 canoe, 4 tents, 8 sleeping bags, 2 backpacks
(You get the idea!)