We are from the east coast. We do not get to California often. We fly into Reno on Saturday Oct 19. We have reservations at the Ahwahnee with National Park Reservations for Sunday October 20 and Monday October 21(cancellation fee of $100). We have reservations for Napa Valley for Tuesday October 22 and October 23 and arrive late in San Francisco on October 24 for 3 days. If it was your money would you cancel the Ahwahnee now and spend Oct 20,21 and 22 around Lake Tahoe? We had wanted to drive to Mono Lake before Yosemite but the southern part with the tufas may not be staffed and we do not want to drive all that way for nothing. We do not want to risk trying to drive through Yosemite and being turned away. Also no stopping is not our idea of fun. A big thank you for any replies.