Anything fun and oriented more towards kids. (ie; arcade, bowling, skating, movies, for a walk, mini golfing, laser tag, sledding, indoor water park, go karting, amusement park, restaurant, or even just hanging out at one of ya'lls houses.)
It depends on what personalities you all have. You might just want to do something small like staying home watching a movie and popping some popcorn or maybe something big like going out to eat at a restaurant and a movie. Or do something creative. Just remember be yourself after all it is your boyfriend!