The recommendable Bay Tour includes at the end the rather long walk to the Grietas. Not difficult, but you have to watch every step over the lava rocks. Nice view of this water canyon, but when we arrived the place was overcrowded, hard to find a spot. But spectacular some youths jumping into the water from the 10 meter rim, very courageous! If you don't feel walking stay at the bar at the beginning of the walk on the rim of the salt lake.