I have two work assignments that brought me to S.F. during Memorial weekend. I will have one week in between where I have no plans, any suggestions for make some trips in the area? I have already seen most of the city, would like to do something outdoor, e.g. hiking? I don't mind driving (perferablly within 5 hours) is there any good tour package offered? I heard lake Taho (?) is close enough to drive to, is there any tour group to go visit from SF? any suggestions would be appreciated!!