If your boots were made for walking, then a walking tour of one of San Francisco's many fascinating neighborhoods or districts may be the perfect activity for you while visiting San Francisco. Even if you aren't all that into walking but enjoy learning about an area and the things that make that area unique, this is the tour for you.
Combining education and entertainment with physical activity is a great way to trick your body into getting out, getting a little sun, and having a lot of fun. The best thing about these tours for me is the fact that they are free. Don't get me wrong, I love learning about the history of the areas I visit. Even more than that, I love hearing about the great and quirky people that made the history; but I have to admit, I love doing things that provide entertainment and don't cost a great deal of money. A donation is recommended and I can honestly appreciate that much more than an overpriced amusement park ride (or worse paying that much just to walk through the gate and never actually riding a ride).
Not all walking tours of San Francisco are free, but the ones that are led by the San Francisco city guides are. You really should check them out at some point during your visit. They offer a great selection of walking tours each and every day that will appeal to a very diverse audience. In fact, there are tours that are geared towards specific groups of people so if you are with your family, it might be a good idea to allow each member of your family to select at least one of these walking tours that is of interest to him or her. That way, everyone is motivated to sit through the selections of the other in anticipation of the trip he or she selected.