In June, my husband and I end an historic trains tour in Santa Rosa and have 4 nights/3 days before a conference in San Francisco. We plan to rent a car in Santa Rosa. Then, we'd like to go on a nature tour, with particular emphasis on redwoods and some of the California coastline. We'd like to stay in a central place that is peaceful and attractive. Bodega Bay? Mendocino? Any suggestions for a home base and natural areas nearby?