This is at one of our favorite parks. They have a "digging adventure" site filled with tons (no, literally I think it was a couple tons) of this river rock pebble.... stuff (something like that) from Alaska. You have to dig quite a bit to discover hidden artifacts (obviously remakes) from one of the native Floridian Indian Tribes. Miles and Eli both love it. The park provides a bunch of Tonka digging trucks and we usually bring a shovel and a bucket.