About three kilometers before Fornells you'll see a modern roundabout with two dancing figures in the middle. There, turn left.
Follow the small road and leave your vehicle at the neighbouring Binime-là beach.
From there you'll have to walk for about 20 to 30 minutes along a path running a few metres from the coastline. This is a protected area belonging to Menorca‘s Natural Area of Special Interest (which stretches from Ets Alocs to Fornells).
Instead of using the road between Es Mercadal and Fornells, you can also follow a smaller road (the "Tramontana way") from Es Mercadal.