We loved this place a lot! It was one of the reasons we wanted to travel south in morocco, as we had seen many pictures of those other worldly arches but actually being there is another thing entirely! To really enjoy your experience you just have to plan in advance and maybe ask the locals about the tides. We didn't really think about that and so on our way back the waves already reached the arches. We got away with wet feet but I imagine it can be dangerous to be closed in between the two arches on high tide.