I did an ATV trip a few years ago, think it was $100, but had to drive about 1 hour north to meat up for it, then spent about 6 hours riding in the desert.
wasn't as good as "go where ever you want" type riding, but was well worth $100.
This was set up by my sister in law, who is no longer my sister in law, so I can't really get you the details, but if you 're interested look, they are available.
Or try contacting a club in the area and see if they have any trips planed, maybe do a ride along...
That's if you want to do any wheeling related stuff while there.