Hi Ladies.
The best swimmable beaches in Cabo are:
Lover's beach (also on the pacific side but ONLY if you're a really really godd swimmer
Hacienda Beach (watch for the stignrays though, stay away from the rocks and you're safe)
Medano Beach (from Baja Cantina to Mango Deck. That's Medano Beach)
From Medano beach all the way up to Club Cascadas
From Villa del Arco or Palmar to RIU it's OK, but not entirely safe, due to strong currents and Undertow.
On the corridor there are only a few spots...
Cabo Del Sol (Fiesta Americana and others) not entirely safe, due to rocks, hard currents and unertows.
Twind Dolphin Hotel (only the beach in front of it, the one next to ir has too much rocks)
Santa Maria and Chileno are completely safe (as long as there isn't any storms)
Maybe el Tule, but is more for surf than swimming
Dreams and Marquis... STAY AWAY. Strong Currents, strong undertows, big waves. Not even locals swim there.
Hilton, Melia Cabo Real, swimmable thanks to the wall they built.
Westin it's kind of safe but still, beware.
Palmilla has a nice beach too, swimmable of course
San Jose (Costa azul, Zippers, and all are mostly surfing spots)
Presidente Intecontinental. Stay Away, there are currents and undertows, way too strong, the create "holes", spots where currents going in different directions crash into each other, creating even stronger currents. Big Waves also.
DO NOT SWIM TO THE ARCH, IT'S NOT WORTH DYING FOR.
Just in case anyone wonders how I know this.... Iwas born here, 28 years ago, my family's been around this town for centuries now, so, Iguess I know something about swimmable beaches around my hometown.