The Highland Park Outer Loop Trail in Pittsburgh, Pennsylvania is an easy 1.1 mile walk along Reservoir Drive which encompasses the park. The trail is marked on the side of the road and separates the road with a bike lane.
Along the way are various groves with shelters and you can connect to a few other trails at the park like the Bunker Hill Trail, Ginkgo Trail, Reservoir Loop Walk, Babbling Brook Trail, Bigelow Trail, and the Carnegie Trail.
Dogs and biking are both allowed on this trail.
Water source: There's a water fountain running during warmer months found along the entrance road to the park.
Poison Ivy: Some can be found off to the side of the road/trail at some points.