The Deer Lakes Park Lake Loop Trail in Tarentum, Pennsylvania is an easy 1 mile paved trail that runs around the two main lakes along Kurn Rd. The trail is flat and usually popular for dog walking and fishing. You can park at the main parking lot, along Kurn Rd, directly between the two lakes to form a loop from the trail.
Waterfalls: Along the eastern portion of the trail, there's a waterfall that lies about 100 feet off the trail. The creek feeds into the eastern lake, so follow the creek to the waterfall. You should be able to hear it from the trail as well.