I live in Kingman, AZ - 100 mi south of Vegas. Our favorite place to go riding is out Cottonwood rd - its inbetween here and Vegas. You can tear it up and go all out on the road, ride down to the river, and there are trails for all skill levels. My b/f used to go riding somewhere just past the base in Vegas - said there were even some baby dunes. I wasn't experinced enough to go the last time they went though so I have no clue where its at - just 'near the base'.