I need some advice about the San Francisco and Oakland areas. We are looking at flying into Oakland from Honolulu (arriving at night), spending 4 full days in the area, and then leaving the next morning. What is there to do? We have 4 kids who will be 10, 7, 4, and 16 months. Our kids travel easily and are pretty adventurous. They love anything nature, science, or ocean oriented. We could get a car, but were wondering if it's possible to go anywhere without one. Also, would appreciate suggestions for hotels that aren't super expensive, but will hold all 6 of us. If it were Southern California, I could plan without any problems because we've done it so many times, but anything north of L.A. and I'm clueless. Any advice and suggestions are really appreciated! Thanks!