If you want to break away from the beach and have a car, you can go. It's not far from the highway, but keep in mind that one of the 2 roads is made of large rubble with steep ascents and descents and beautiful views of the mountain village. Cows, of course, lie and walk everywhere. :-) The dolmen is large, easy to find - next to the road.
We went specifically to find this place. Found. There are 4 dolmens on this site. Only 1 is well preserved. 3 others are either in the overgrowth or underground or destroyed. Not far down to the river is a beautiful waterfall.