The tallest mountain in New Mexico is Wheeler Peak. It has a trail that crosses it which you can climb from the base or 3/4 the way up from a lake that is accessible by 4X4. The peak (marmots seem to like to be above tree line) has a colony of marmots. Since the trail is well used they've gotten used to backpackers. They'll actually take food from your hand if you're brave enough... The whole time I was doing it though the Jeff Foxworthy skit about the guy getting his nipple bitten off by a beaver kept running through my mind.