Some of the things anyone can do on a 21st birthday include donating to charity, going on a road trip, completing 21 dares, going out with friends or hosting a 21st birthday party. At the age of 21 most people are free to make their own decisions and this can be a great time to just do whatever feels right provided it is legal.
Giving away clothes, shoes or some money to help the needy can be a great way to mark the 21st birthday. It may also be quite fulfilling to take a road trip with friends just to enjoy new destinations. Hosting a party or going out for a fancy dinner with friends is bound to be an enjoyable experience for just about anyone.