This is a must among the Grazalema hikes. You need a permit (free) from the National Park Administration. Some travel guides say you need to go the El Bosque and well in advance but that is outdated information. We got ours for the same day right at the Tourist Information in Grazalema with no problem at all. However, we went...
From Grazalema you can make beautiful hikes. Rocks, beautiful scenery, vultures, rivers, mountains, everything in place. The tourist service in town is very helpful and can provide you with maps for hiking.
It is an amazing, easy and funny route. I recommend to do it on spring season, because you may view a strange flower is called Peonías. Also, I recommend to wake up early in the morning because you can see some typically vulture. It is very easy, children may do without problems
Nice to have it explained how the chasm came about. Good to know about the different types of rocks involved. Lots of cars stopping to take photos, and unfortunately somebody relieving themselves - but otherwise beautiful view