The Bay of Palma is a near-perfect half-circle roughly 20 kilometres wide, and its shape is the reason boats have gathered here for two millennia. Romans anchored under the same headlands. So did Catalan traders. The bay's geometry funnels a reliable afternoon thermal — the embat — off the water and back again each evening, which is why the sailing calendar here runs on wind rather than season. El Arenal sits at the bay's eastern shoulder, in the municipality of Llucmajor. For most of its history it was a working shoreline: salt flats, fishing shacks, and the quarries at Cap Enderrocat that supplied the honey-coloured marès sandstone used in Palma Cathedral. Tourism arrived in the 1960s and rebuilt the seafront in a decade. The water, however, did not change. Posidonia oceanica meadows still carpet the seabed offshore, filtering the shallows to the clarity that draws snorkellers today. Those meadows are UNESCO-listed further along the Balearic chain and remain the single reason visibility here outperforms most Mediterranean resorts. Club Nàutic S'Arenal, on Carrer Roses, is the practical heart of el arenal boat hire. Its marina holds roughly a thousand berths across pontoons that face directly west toward Palma. Entry to the facility itself is free, at 0 EUR; the cost sits with the vessel and charter chosen. The club has hosted international regattas for decades, and the same pontoons that stage race weeks send out the catamarans and cruisers that carry visitors along the coast. What the bay offers is legible from the deck. To the west, Palma Cathedral's sandstone flank rises above the old harbour wall. To the east, the limestone cliffs of Cap Blanc drop sheer into deep blue. Between them lie the coves — Cala Blava, Cala Pi — reachable only by water or a long walk down. The north coast, served by the longer catamaran sailing tours with BBQ meals, presents a wholly different Mallorca: the Serra de Tramuntana falling into the sea in terraces of pine and stone. The fleet reflects this geography. Catamarans handle the bay's flat morning water with stability suited to swimming stops. Monohulls suit the evening breeze, when Palma Bay sailing runs toward sunset and the cathedral catches the last light. The distinction between an el arenal boat hire tour and a simple crossing is that here the coastline itself is the itinerary — every anchorage is a different rock, a different depth, a different colour of water.