Take the right fork of Rain Forest Loop out of the parking lot as the left has a washed out bridge. Starts easy until you get off the loop. Backside of the loop is the beginning of the Boundary trail and it gets uphill in a hurry and doesn't relent. Little over halfway is a waterfall. Good resting spot. Not much a view from there though. Keep going to the top of the ridge for spectacular views. Good heart rate elevator. Doing it again for sure.