Suggesting a birthday party at a park to your 12-year-old may not elicit cries of glee. But for younger children, parks make for excellent party venues, especially in the spring and fall when the weather isn't too hot or too cold. Most parks are outfitted with picnic tables, grills and playgrounds. All you have to do is bring the cake.
Skateboarding parks and nature centers might be better options for an older crowd. Tween boys might think a skateboarding-themed birthday is cool -- and so will his friends. Nature centers may offer outdoor and craft activities that will take care of the entertainment portion of a birthday party, and older kids should have an easier time staying engaged and following directions.