I was there this spring. It is wonderful. There is nothing to do really, you wander around and slowly the scale of the sculptures, the viewing distance from the pyramid and mounds, the serenity of the nature seeps into your brain and for a time you surrender to that indescribable feeling that arises from being immersed in something big. Big in terms of scale but also in intent from the makers.
It's a bit like being in a cathedral, a hilly forest and a big, silent city at the same time.
Nothing to do? It's a sculpture park. Surely the something to do is to appreciate the art?
At the opposite end of the world is Frogner Park, Oslo, home to Vigeland's sculptures. Also nothing to do except appreciate the art along with quite a few Japanese people who travel to Oslo do just that.
It's a bit like being in a cathedral, a hilly forest and a big, silent city at the same time.