Rampart is great. Can't beat it. You can easily do 50 miles a ride and never hit the same trail. It is very easy to get to:
C470 West to Santa Fe
Santa Fe South about 10 miles to Sedaila
Go West at the Sedaila Bar and Grill about 10 milies to the entrance to Rampart.
Park along Rampart Range Road.
Make sure you have a map. Easy to get lost until you get use to the area.
The trails are just wide enough for a four wheeler which there are an increasingly number of out there. You always have to be aware of head on collisions but running into one of those pigs would suck.
Do what I do, let your buddy go first. The trails are slick and dusty. Unless it rains, then it is like riding on a rail, super tacky. Other than Woodland, which is closed, there really isn't any other woods riding close by. But the mountains are only 90 minutes away.