• Encourage guests to dress in their fanciest getups.It's party-time for the little girl image by Ivonne Wierink from <a href='http://www.fotolia.com'>Fotolia.com</a>
  
  Turning 13 is a milestone in any kid's life because it marks the unofficial divide between childhood and young adulthood. Celebrate the landmark occasion with a party that indulges the birthday girl's growing independence and fosters the creation of fun memories with her friends. Think outside the birthday-party box or go with a classic theme, depending on the birthday girl's preferences and personality.
  
  

Hotel Slumber Party

• A hotel room party may require fewer guests than another party.hotel room image by Albert Lozano from <a href='http://www.fotolia.com'>Fotolia.com</a>
  
  Modify an idea from the article "13th Birthday Party Ideas" on the Celebrations website and hold a classic slumber party at a hotel. The article advises booking adjoining rooms, one for parents, the other for teens, and setting clear ground rules about what the party guests are and are not allowed to do. After swimming in the pool and enjoying dinner and cake at a nearby restaurant, retire to the room for a night of popcorn, candy and a teen-appropriate movie. Allow the party guests to order one or two sweet dishes to share from room service as a late-night treat.
  
  

Extreme Activity

• Send photos of the adventure to guests as favors.rafting image by Dario Principe from <a href='http://www.fotolia.com'>Fotolia.com</a>
  
  Challenge party guests to test their limits with an excursion birthday party to participate in a sport or activity considered "extreme," such as whitewater rafting, rock climbing, sea kayaking or outdoor paintball. Such activities build confidence and are actually quite safe when led by a trained, certified instructor, but still challenge kids physically and mentally. Most importantly, they offer an opportunity for a group of friends at a transition point in their young lives to make exciting memories together.
  
  

Summer Luau

• Give out grass skirts as party favors.straw woven mat image by Sirena Designs from <a href='http://www.fotolia.com'>Fotolia.com</a>
  
  Follow the suggestion of the article "Summer Party Ideas for Kids" on the Emily Post website and host a summer luau. Such a party is particularly suitable for being held at a pool. Bestow a flower lei on each arriving guest. Light citronella tiki torches to add atmosphere and ward off biting insects if that can be a problem in your area. Feast on Hawaiian-style fare such as pineapple-glazed pork and vanilla bean cake with mango ice cream.