The Grotto is a nice half-way oasis on the Seven Hollows Trail at Petit Jean State Park.
This trail is about 4.5 miles in length and forms a loop so you don't have to backtrack. Hiking during the wet season is the best time to experience nice streams along the way, as well as a nice waterfall at the grotto. I've hiked this trail several hundred times over the past 30+ years.
Photo # K04_9326bw.
(c) Kelly Shipp