Rock Spa is the 30,000-square-foot spa of the all-inclusive Hard Rock Hotel Los Cabos in the Diamante development on the Pacific side of Cabo San Lucas. It has 36 treatment rooms and a hydrotherapy center with whirlpools, a steam room and a sauna. The spa asks guests to book treatments at check-in, so access appears geared to hotel guests. Open daily 9:00 AM to 7:00 PM.