In St. Louis they have a place called Skyzone that is a giant dodeball place on trampolines. All my friends and the girl I was dating where there, it was such a great and magical day for me. Had pizza and cake there too, I will never ever forget that day or night as long as I live. The other day I was looking at pictures of it and almost teared up.
Also my friend who hit a year a few months before me had a BBQ which was really nice as well. Lots of food and friends. I'd just be sure to treat yourself to something special with those who loved and supported you this past year.