The turn-off to Legzira is about 10 kilometres from Sidi Ifni If you are travelling from Mirleft. It is a short drive along a decent road to an apartment complex, then there is a rough road on the left which drops down steeply. If you don't want to risk your car you can park at the top and it is only a 2 or 3 minute walk down to the beach where there are a couple of small pensions and restaurant shacks.
The walk south along the beach is magnificent with the wild Atlantic as a backdrop and soundscape. The arches are wonderful natural monuments and with a little imagination one looks like a dragon's tail embedded in the sand.
If you are visiting Sidi-Ifni this makes a great little sidetrip.