I really enjoyed getting my Wilderness First Responder certification - but that's a 9-10 day commitment, plus renewals every couple of years. I took mine from NOLS/WMI in Arizona. Highly recommended if you have the time and inclination.

I tried a local Wilderness First Aid class, and it was a waste of time; it was just a basic Red Cross First Aid class with a Wilderness Medicine pocket-sized book tossed into the mix, and very little discussion of anything outside of standard city-style first aid.