The Black Rock Long Loop Trail at White Tank Mountain Regional Park in Waddell, Arizona is an easy 1.6 mile hike that connects to the Waterfall Trail.
The hike is mostly flat and runs along the foothills of White Tank Mountain, but has interesting scenery nonetheless. This trail is less trafficked than the Waterfall Trail, so you can use it as a more secluded hike in addition to hiking up to the falls.
Admission Fee: There's a $7 fee to enter the park with a vehicle. You can read more about the fees here.