I am going to assume your not looking for pole dancing lessons or how to do sex tricks from the chandelier lol.
Here are some ideas. things we have done that turned out to be a lot of fun. Go to one of those places like painted penguin and make a special thing for your future home.
go out to dinner and something totally cheesy like couples bowling. Go for a picnic if its not cold where you are.
I would skip the big hoop dee doo things as in the grand scheme of things valentines day is only a hallmark holiday. not one of the true biggies like christmas. If you don't set the expectations to high then can never be dashed.