Plan yourself or a friend the most memorable 21st birthday with these ideas! Trust me when I say these are some of the best things to do on a 21st birthday! Note: There are affiliate links included in this article. Check out my disclosure policy for any questions. Whether you're trying to plan a party for yourself or for friends, it always feels impossible to think of ideas that are going to be fun. And when you finally think of something, just about a million other people h[...]