Otter Creek is the closest place, in my opinion, for Louisville residents to get out into the woods and even camp out. There are several trails that are well-marked and interconnect, so you can hike anywhere from 100 feet to 8 miles or more. It is used by horse riders and bike riders, but on the typical afternoon, I rarely meet anyone out there. It's especially peaceful in the colder half of the year. Along the trail are several gorgeous overlooks onto the Ohio River, as well as peaceful trails along the actual Otter Creek. For camping, there's an area for car camping with quite a few sites (40 or more), but it costs $15 a night. There's also several "walk-in" campsites that are more secluded several hundred feet into the woods (but still very close to where you park). Very nice, meandering trails for getting away from it all, I like it a lot and hike there often, day and night.