Etiwanda Falls is a short, easy, miserably hot hike to a gorgeous waterfall in Rancho Cucamonga. At just around 3.5 miles (round trip) most hikers can reach the falls in under an hour. But I must warn you, it is a long, hot hour up a rocky un-shaded hill. According to AllTrails we completed the entire trail with a moving time of just under 90 minutes.