Not far from Centerville are the Hell Holes Nature Trails and Caves. You descend 25 feet into a giant, naturally formed cave that scares the crap out of you when you realize you’re all alone and haven’t seen anyone else outside anywhere.august 16 2007

After that there’s a 3.2km walk through different kinds of nature (hills, swamp, plain-y area) to return to your car, which I did not do well at because I’m not good at nature.