I just moved from there.
Go to Greenhorn. I know there have been a lot of issues with illegal offroading and trash there but 4wd clubs have also been doing cleanup runs. It is BLM land so you should be fine. Hansen Bros. also does some excavating there so stay clear of the big machinery. It is accessable from Greenhorn Road and You Bet Road. Just drive all the way to the end and you get there! Look it up on the county maps (chamber of commerce) and/or Google Maps or Google Earth!
-Kevin