We are planning a trip to San Francisco in Aug or Sep. We'll be flying to San Francisco and renting a car. We'll have 10 days total. Would like some suggestions of good short trips to take from San Francisco. We are interested in visiting Sonoma area and perhaps north of SF. We are from Ohio and have never been to California. Also would like to know if it would be worth getting a convertible style car? I know that is a preference but don't know what the weather is like generally speaking. Any tips, suggestions greatly appreciated.