A few of us are in San Francisco in early December and have a couple of days free after a conference. Last year we were late enough to go skiing. This year we thinking of going mountain biking. We will need to hire bikes Sat-Monday lunchtime. If we can find something 2-3 hours drive away we could ride Saturday afternoon, full day Sunday and maybe Monday before heading back to the airport. I am the mountain biker but everyone is fit(ish) and up for a laugh. Sort of 'red' grade would be good. We also need somewhere to stay for a couple of nights. Any advice of any sort (well constructive) very welcome.