Does he have any hobbies? maybe think about something he needs/likes for them. For me I like fishing and shooting, so a new reel or a tin of pellets would be fine.
I don't think guys really expect anything for Valentines to be honest, it's just an 'Americanisum' or another time for the shops to 'cash in' or am I being a bit synical??
A hug, kiss and a nice meal is fine for most blokes. (and a good
after
)