Park in the upper lot of Southwestway Park, follow the trail going south from the kiosk, bushwhack the last hundred feet. It shouldn't be hard to find; let me know if the coords are off badly. It's big enough for trackables, and stocked with some kidswag. Be sure to return everything to the way you found it, for the benefit of the next finders. An unactivated geogem trackable is there for the FTF.