Don't know what to get him for his birthday! Suggestions??

My boyfriend's birthday is coming up soon and I'm unsure of what to get him! I'm already taking him out to dinner and a movie at a really nice theater, but I'm not really sure what gift to get him. We've been dating for about 4 months now. He's not really big on birthdays (he's turning 24) so he doesn't really want a party, more of a gathering with my family instead.I want to get him something but I'm not sure!! Are there any suggestions you guys may have? Thanks!