Hi all. Firstly what a great site, so much info. I have a couple of questions. We are coming to the states in July, RV hired from Cruise America, starting out from LA. Do you have to pre book RV sites or can you just turn up and take a chance, also can you park RV's in SF ( central- ish) as we want to visit Alcatraz. Not sure where we're heading after this, but want to take in Yosemite, possibly Vegas, can you suggest a thread or route.