I am probably one of the most free-market leaning ppl on HN. National Parks are a very good place to curb the free market. It's a classic Tragedy of the commons, the value is huge and would not exist without the government. There is no incentive structure where privatization would leave millions of acres open for a token fee.

I quite often think how people should be encouraged more to go to the natl. parks, they really take your breath away and are something to cherish. Buffalo running wild, Grey wolves if you're lucky, crazy weird geysers, go!