Whatever you do, don't eat out.
Many years of working at a flower shop on February 14th when throngs of unimaginative (but to be fair, conscientious) dudes descended on the store en route to their romantic dinners taught me this is the night to stay away from popular restaurants. Unless you like set menus, harried service, and canned romance.
Best to stay home, cook, open a nice bottle of wine, bake cookies, go see Midnight Cowboy, whatever.
Happy Valentine's Day.