Take a hike on the path in the woods. Walk out on the isthmus on the path to the "magic lake" where the things live and swarm. The cache lives in a hole with a rock door. Be careful. The first step down is a doozee. When you find the little cache make sure you "close" the rock door snuggly.
This cache has been approved by the park authorities. Note - this is a Ramsey County Regional park and the park is open 30 minutes before sunrise to 30 minutes after sunset.