If you're looking for a place to ride in or near the Bay Area, don't bother with Sand Hill Ranch in Brentwood. Not only is it way over priced ($20 per quad, $15 per motorcycle, $5 per spectators), but the upkeep on the tracks is dismal. Additionally, instead of staying open until sunset as they advertise, they often close down early for "maintenance". Don't bother asking for a refund if they pull this on you, they'll just tell you to F-off. Nice folks!