Cala d’Albarca is a truly unspoiled cove in the north of Ibiza 15km above San Antonio. Do put on sturdy walking shoes because the trek here is a long one. You will spend about 45 minutes.
Follow the road from San Mateu heading north until you come to a fork. Then turn left at this one. Then take the 1st left again and then the next right. Then continue until the road bends sharply to the right. Then take the hiking trail from here.
Once you get there you can enjoy the beautifully impressive natural stone bridge. There is not really a beach to be found here. Especially large boulders lie here. By the way, there are plenty of flat boulders to sunbathe on.