The one good one I had was a bunch of friends and I who didn't have dates got together and had a lonely heart's club dinner. We had a blast hanging together and having dinner. Probably the best Valentine's Day I have ever had.
I usually grab a bunch of single friends and hit Hooters. Service is usually really good on Valentines Day, since the waitresses figure they can milk extra tips out of people. Also, it's a place that you can get in without reservations.