The basic idea is still right, but I guess we should all get a little more creative. The things you do on Valentine's Day all depend on the person or the couple. Here are some basic ideas on how to spend your Valentine's Day. There's a lot to do even if you don't have a lot of money to throw around. Walk around Mission Bay or any beach, visit Old Town, Balboa Park, or Julian.
Flowers can be a nice touch and addition.
Having dinner together is a good idea and most anywhere is a good place as long as everyone agrees on it. Renting or seeing a movie is a great idea. If you're not a homely person, then decide on a place go to. You can either hit up a party, the Gaslamp in downtown, or somewhere out on the town. Basically, spend time with your special someone and be sure to make them feel special.