In this article we're going to discuss what to do when you reach the age where you become a legal adult.

Depending on where you live, that can either be 18 or 21. Most people consider 21 to be the big day so we'll focus on that.

Reaching your 21st birthday is a big milestone. You're no longer mommy and daddy's little boy or girl. You're a legal adult, like it or not. Most kids actually look forward to this day and can't wait to get out of the house and spread their wings. Of course before they do that they'd like to have a party that really signals the transition from child to adult.

One of the best ways to celebrate this birthday is to come to the party dressed in what you wanted to be when you grew up. So, if you wanted to be a policeman then go to a costume store and rent a cop suit. Wait until you see the looks on the faces of your guests.

Another thing you could do is come dressed in what you were wearing when you opened the invitation to the party. Of course if you weren't wearing anything this may not be a good idea. Even pyjamas could be kind of risky.

Another great idea is to have what they call a "Mad Hatter Party." This is where everybody comes dressed in some funky hat. You'll be surprised at some of the strange head gear there is out in the world.

Another great theme for a 21st birthday party is to have an ethnic night. Pick some country and then feature food and music from that country in your party plans. You may want to hire a band that specializes in that kind of music and a caterer that specializes in that kind of food.

Another great idea for a 21st birthday party is to have a "Mafia night." Everyone dresses up as mobsters. The ladies can dress up as gun molls. If you can find some imitation Tommy guns from the roaring 20's that would be a really nice touch.

Another possibility is to have a cartoon character party. Everyone comes dressed up as their favorite cartoon or comic book character. It will be interesting to see how many Superman and Batman costumes you'll have show up. Top picks for the ladies will probably be Wonder Woman, Catwoman and Batgirl.

If you're going to have an evening function most likely it is going to be formal and is going to cost you some big bucks. A great way to save your wallet a bit is to have a breakfast or a lunch or maybe even a picnic. If you're celebrating your birthday in the summer you might want to consider going to the beach. Those are always fun parties. Just make sure you tell your guests that bathing suits are optional.

In the next article in this series we're going to go over such things as venue, photographer, invitations, decor, music, cake, speeches, master of ceremonies and ice breakers.