My husband will be going to Hayward for work for 10 days, leaving in two weeks. I plan to join him for a week - we will be staying in Union City. We have never been to California and plan to see as much as we can after work on the weekdays and will have all day Saturday and Sunday. Any advice on what to see and how to get to the tourist spots in San Francisco would be appreciated - Fisherman's Wharf, Alcatraz, Chinatown, Golden Gate Park, Redwoods, etc. This trip came up fast so I don't have a lot of time to figure things out and right now it seems difficult but I know this forum will help me out. We are very active people and don't mind public transportation or walking to make things easier as I hear the traffic is horrible. Also, is Union City a safe place to stay?