Sundays at Marquee Dome mean sinking into the sun-soaked energy of one of the Cosmopolitan's signature pool decks, where two pools and a rotating cast of DJs keep the day moving from late morning onward. The dome setup gives this particular slice of Marquee a slightly more enclosed, intimate feel compared to the wide-open dayclub sprawl, but you still get all the hallmarks: cabanas with plunge pools, cocktails circulating on trays, and a crowd that's dressed for both swimming and being seen.

Expect the usual dayclub rhythm—people lounging poolside early, the energy building through the afternoon as the music picks up and more bodies migrate toward the dance floor near the pool's edge. Food and drink service runs throughout, so there's no need to leave your spot for a refill, and the gaming area gives you somewhere to post up if you need a break from the sun. It's the kind of scene where a lazy pool day can slide into a full-on party without much warning, depending on who's on the decks and how the crowd feels that particular Sunday.