Give him a very very special day. I'm a guy too but hope I can
help. Something special and romantic for a man is the
question.
Maybe try these steps, be the "Guy" for the day.
1. Dress up beautifully.
2. Rent a really posh car, insist that you pick him up. (Surprise
him!)
3. Bring him to a posh restaurant and treat him to a fine dinner
=)
4. Spend some time with him alone in a romantic place, then give
him a present! (Be bold, a new pair of boxer shorts with your name
on it will be sooo cool! Well, it also helps to keep him loyal, if
you know what I mean 
) Personally, I like a more quiet places like an
islotated part of a beach rather than a place with lots of
couples.
5. Book a room at a 5-star hotel, cuddle each other and whisper
sweet-nothings till you both fall asleep zzzz....
Well, it prob will cost a lot but I think it'd be the most
memorable thing a woman has ever did for him. However, guys have
very different views of things that are romantic. To some guys
being romantic isn't even in their dictionary. So it is left up to
the women to show the man what romance really is. 
