Praia de Boiao
Alvor, Algarve, Portugal

Praia de Boiao sits along a stretch of coast near Alvor in Portugal's Algarve, actually three small pockets of sand strung along a rocky point that only connect fully at low tide. Limestone cliffs formed some 25 million years ago rise above the water in odd, sculpted shapes, and there's no bar or sunbed rental to interrupt the view.
A genuinely scenic stretch of cliffs and hidden coves without the crowds of Praia da Rocha next door, though the lack of any facilities means it's a bring-your-own-everything beach.
Time a visit around low tide if seeing all three sections of the beach and the passages between them is the goal, since high tide cuts off some of the connections.
The walk from Praia da Rocha takes about 40 minutes along coastal trails, or a taxi from Portimao or Alvor is a quick, inexpensive option.
There are no steep stairs or cliff descents to reach the main beach areas, though the connecting passages between sections depend on tide and involve some rock scrambling.
June through September brings the warm, dry Algarve summer, with the calmest seas and best beach weather typically running from late spring through early fall.
More Europe beaches

Kedrodasos Beach
Chania, Crete, Greece · Europe
Kedrodasos Beach lies on the southwest coast of Crete, Greece, just over a kilometer past the more famous Elafonissi and separated from it by a low headland that keeps the crowds thinner here. Ancient juniper trees, not the cedars the name suggests, grow right down into the dunes, and the water stays shallow and clear over a stretch of sand more than a kilometer long.

Voulisma Beach
Agios Nikolaos, Crete, Greece · Europe
Voulisma, also called Golden Beach, curves around the Gulf of Mirabello about 15 kilometers south of Agios Nikolaos on Crete, Greece, backed by a rocky cliff thick with Mediterranean scrub. The turquoise water here is calm enough for kids and shallow enough that it warms up quickly through the summer, and it's fully set up with sunbeds and beach bars for anyone who wants to stay all day.

Nanou Beach
Symi, Dodecanese, Greece · Europe
Nanou Beach sits on the south coast of Symi, Greece, a long stretch of white pebbles reachable only by boat and hidden behind a ring of high hills that keeps it out of view from the rest of the island. A small canteen serves lunch right on the beach, and the water here runs clear enough for good snorkeling and diving just off the shore.
