Arriving in SFO at 1:00 pm on a Sunday, pick up rental car and driving to downtown Napa for 3 night stay. Any suggestions on most scenic route? Is it worth the drive over GG bridge and maybe on highway 1 for a while to see the coast? Will be driving back to union square area on a Wednesday to stay 4 nights. May not keep the car in SFO the whole time, but would like to see the coast. Thanks!