Playa de Las Vistas is the big sandy beach between Los Cristianos and Las Américas. It is artificial, broad, accessible, and built for heavy use, with calm water, lifeguards, showers, sunbeds, and a continuous promenade behind it.
This is the best straightforward beach day in Los Cristianos. The central fountain-like island in the water gives it a slightly odd resort flourish, but the practical virtues are real: space, sand, facilities, and easy access.