Well, first off, it is far better to cook for two at home than it is trying to have a romantic dinner out on one of the busiest days of the year for restaurants.
I like to keep the meal light, with lots of Champagne and wine, so you are a bit more, ahem, 'inclined' towards activity afterwards...last V.D. (lol, V.D.) menu I did (when not working) was a small appetizer of grilled sea scallops on marinated cucumbers with salmon caviar, asparagus consomme, steamed sea bass with baby veg and finger potatoes, and a lobster stock reduction, and port-poached mission figs with port reduction and a creme fraiche drizzle. We enjoyed at least 2 bottles of vintage Bollinger, and a little port. It was a fine evening indeed...