No special access issues
Cabo Negro (20min)
The hike down the cliff is a bit delicate, it’s necessary to be sure-footed.
Two paths to go down : the second one is a bit easier and it feels less high (height difference:-35 m).
In 10 min you reach the Menhir de Tresmurios. A few meters further you will see a pole. Path no.1 starts just here (height difference : - 45 m).
For the second path, continue from the pole to the right, leave a first path on the left that goes through the thorny bushes (long pants advised), and go 100-200 m further on a more confortable path (but at first less visible). At the top of the cliff you see now the boulders below, and there you find another path that leads to the Cantábrico boulder.
Take the tide times into account, the place can be dangerous with strong waves.
Blocs 13-17 : wait for low tide
After rain wait at least 10 hours for the boulders to dry.
Playa Negra (15 min)
Park at Mirador de Portazuelos. Then follow the dirt road (take right at the fork) until you reach the top of the cliff. There you see the Poseidón boulder below on the edge of the shore. Turn back 100 m before, a path is going down and follow the rocky slopes to the boulders (height difference : - 35m).
Be careful it’s better to be sure-footed too, but it’s easier.
Choose to climb at low tide.
After rain wait at least 10 hours for the boulders to dry, and more for bloc 3.
Water & supplies in Montmeril there's a fountain right next to the church, and a grocery store in the village.