I've been riding every weekend with a small group of friends (5 of us). Typically our rides are ~20 miles long - mostly flat with a few hills. We're looking to venture out a bit, and maybe do a road trip, do some camping, and trail riding. Several of us are out of shape, so it can't be anything too difficult. 30-40 miles max, and no huge climbs. We're thinking pretty much anywhere in northern California, or possibly Oregon. We're coming from the South SF Bay area.

Any recommendations?