I've never taken a swim at Chatfield Hollow. There was a scare a couple years ago about the lake, but even so, I'm not a huge fan of lake swimming in general. However, Chatfield Hollow State Park is certainly one of the finest places for a rambling hike, with its "Indian Caves" (see video below) and jumble of ridges and swamps. Take a winter walk there, and you'll be surprised at the silence. And don't miss the blue trail that heads off to the south across the road, which leads to yet another cave, and even more solitary joy.