The Rock Shelter Trail in McKinney Falls State Park is a nice short trail that leads along the top of the banks of Onion Creek to a rock overhang that Native Americans used for shelter. It's open for hiking only, but you can use it to connect the Homestead Trail with the Onion Creek Hike and Bike Trail. If you're on a bike, use the road instead, it parallels this trail.
There are also a few bouldering spots along this trail, so look down from the trail to the creek - you may see some rock climbers,
