WHAT ARE SOME GOOD 18TH BIRTHDAY PRESENT IDEAS?

I don't want to buy my boyfriend anything because to me, things that are bought seem very insincere. I want to make him something, but I'm not sure if he'll want it. I made his last birthday gift which was a box of little trinkets that explained everything that I love about him. This year I wanna make him something but I'm not sure what to do. We've been together for almost 13 months now. Any ideas?