I'm heading to SF for a week for a vacation and am not going to be able to bring the bike along. I was hoping to find a good shop that will rent me a real bike, something that I can use to hit up some of the local trails for a day or 5 without dropping a huge amount of cash if possible. On that note, what are some of the trails that I will not want to skip? I know there are a ton of options, but I'm from NC and have never been west of the rockies with a bike so I must admit to being a bit lost as to what there is to ride and do out there. Any riders in the area want to head out sometime next week and help a confused tourist, haha?