• One cool birthday party idea is a scavenger hunt.happy birthday image by Photoeyes from <a href='http://www.fotolia.com'>Fotolia.com</a>
  
  There are many different birthday themes for any age person. The key considerations are knowing how much you want to spend, how many guests to invite and whether to hold the party at a house or off-site somewhere. Some of the coolest birthday ideas include a scavenger hunt or a decades costume, lifetime of memories or luau pool party.
  
  

Scavenger Hunt

• One cool birthday party idea is the scavenger hunt. It is best to create a scavenger hunt that involves some real searching. For example, do not just hide items around your yard or house. Plant items around your city, such as at the local post office, downtown, at a local restaurant, or even near a pond. Keep track of where you put the items. Hide them so others outside your party cannot find them. However, make sure you are specific when you write clues for your party guests. It is best to divide people up into different teams. That way people can work together to search for the items. Make the scavenger hunt entertaining. For example, if you plant the clue at a park, instruct your party members to sing a song before they can move on.
  
  

Decades Costume Party

• Throw a decades costume party for the birthday celebrant. Pick the birthday girl's favorite decade or movie during that decade, then have people dress up like various characters. For example, if you choose the 1960s, people can dress as hippies with long hair, headbands and embroidered peace signs. You can easily find cassettes or compact discs of 1960s tunes at the library. Create a list of 1960s trivia and quiz all your party guests. The one with the most correct answers can win a gift certificate or some other prize. Another variation to the decades party is a "back to the teen years" party, according to Dollar Stretcher magazine. Have people dress as they did during their high school days. Select some favorite tunes from that era and have a blast!
  
  

"This is Your Life" Party

• Another cool party idea for an older person is a "This is Your Life" party. This type of party is perfect for someone who has turned 50 or 60. Have family and friends surprise the birthday celebrant, then for a bigger surprise, invite some people the person has not seen in years. For example, have an old teacher, navy buddy or childhood friend say something over a microphone. The birthday boy can then try to guess who the person is. Shortly thereafter, the two can be reunited for a little chat about the past. Be sure to post up plenty of pictures of the birthday celebrant from various decades.
  
  

Luau Pool Party

• A luau pool birthday party can be a lot of fun for any age group. Invite your guests to wear colorful kimonos, grass skirts and leis. Play songs like "Tiny Bubbles" and "Red Red Wine," as well as the typical Hawaiian hula music. For adults, serve drinks with tiny umbrellas or other beach-related items. To make your party high traditional, slow cook a rotisserie pig for dinner.