You're looking for a regular-sized box on a beach that isn't marked as such on maps and where tourists don't typically go.
On sunny days, you might meet a few locals here looking for some peace and solitude.
And as a geocacher, you can now search and find something here too - even without disturbing these people.
On your way to the cache you will pass some interesting human made structures 🙂
Also on this way, under certain rare circumstances, the water could touch your feet - we're at the beach after all, right? 🙂 - but it shouldn't stop you from keep moving and finding the cache.
About this cache:
Go down to the beach. Go along the coast to the end. Go up a few meters to the left. See the spoiler. Find and log the cache.
PLEASE: Do not place stones directly on the box. This is how most caches on Fuerteventura get broken. Please re-hide carefully.