My son is turning 9 on June 30. We'd hoped to just invite all his buddies over for a pool party, but the pool is still in boxes in the garage. If everything goes perfectly we should get it assembled and at least ready to fill by Sunday, but nothing ever goes perfectly around here.

So who knows?
If you were a 9 year old boy...would you rather wait a few weeks past your birthday to have your party, and have the kind of party you'd been wanting? Or would you rather have it on or near your birthday and do something different?
Here's the alternative I've been thinking about.
My son is into Geocaching this summer. For the uninitiated, Geocaching is sort of a treasure hunt. People hide containers filled with little "gifts" - happy meal toys, dollar store trinkets, etc., or maybe just a log book - and other folks with GPS gadgets get on Geocaching.com to get the coordinates, then go find them. If there's "swag" there, you are supposed to trade an item for an item. There are also "travel bugs" and "geocoins" that get swapped and travel around the world. But the fun is in the hunt!
We don't have a big place, just 1.5 acres, but big enough I think for us to hide some "caches". We can also use the field and woods behind our place. My idea is to have a geocaching party. Split the kids up in to groups of 3, let them take turns with the GPS and find the caches within a set time limit, and they get to keep the goodies inside.
While they wait we'll also have summer fun stuff like water guns, water balloons, maybe even a slip & slide, sprinkler to run through, etc.
What do you think? Would the average 9 year old boy get into this, or think it's just weird?