Knowing your interests are also important: for example, for art lovers, the current Monet in Normandy show at the Legion of Honor in Lincoln Park (NW part of SF) combines a blockbuster art experience with great views of the Golden Gate portion of SF Bay and a view back to downtown SF. Nearby, for culture lovers is "Clement St." which is a 13-block shopping street (from Arguello to Park Presidio) in an authentic SF neighborhood where, one can find all 6 cuisines of China + other Asian + Russian + Italian, etc. cuisine. So it all depends on your interests.