Ok, On top of Rendezvous Mountain in the Teton's (or about as close to the top as most of us are likely to get.)
If you need a cache about 10K feet, and you don't want to climb it, this may just be the event for you, or if you do want to climb it, then this really is the event for you.
There are two ways up, the easy but costs a few dollars is the Aerial Tram, and the hard way (4,139 ft of vertical ascendence during a long hike.) The tram takes about 12min from launch 'til landing, and the meetup is only about 100' from where you exit the Tram.
Please log a will attend if you're coming, or at least log a note saying you'll try to attend if you're thinking about it, but time may not be on your side.
I'll be the guy with the GPSr.