here's a totally different idea. drive across golden gate bridge to marin, and off hwy 1 to point reyes national seashore. we were there last weekend. it is always spectacular. lots of hikes, easy to hard. the light house is amazing. we saw gray whales migrating. the wildflowers are the most spectacular i've ever seen up there, probably due to the greater than normal rainfall. fabulous. it can be a day trip from the city or you could easily drive over to napa valley.