I just put together an adult birthday party for a friend in March. She had received a GPS for Christmas, but hadn't been out to use it or learn to use it. I set it up as a multi-cache experience in the morning with brunch served afterwards. She brought both her boys to help with the hunt and I invited another geocacher. So between 1 experienced geocacher with his GPS, her GPS, and my GPS they hunted in the woods for clues and mini-treasures. Her Birthday present was the final cache. I served a wonderful breakfast Straka, bacon, juice, and fruit.
Prizes used in the caches included:
T-shirts
non-activated Travel Bugs (so they can create their own profiles & continue caching on their own)
pocket calculators from the Dollar Store
party hats
noisemakers
They all had a blast! Her youngest boy asked me on THAT DAY to do a party for him this summer! I will be very happy too.
For his party I am already planning to have several multi-caches setup. Depending on how many kids and adults they will be split into teams of up to 5 kids. Each team will have their own multi-cache to complete. It seemed to me the boys got the hang of the GPS rather easily.