Sunday at Marquee Dayclub turns The Cosmopolitan's pool deck into the kind of scene that makes you forget what day it is. Party Pupils sets the tone with a lineup built for lounging in the sun and dancing in wet swimwear at the same time—expect house and dance grooves rolling through the two-pool complex, bouncing off cabana walls and drifting over the gaming tables scattered around the space.

The vibe leans into everything a Vegas dayclub does well: infinity-edge dipping pools glinting under the desert sun, cocktails passed around on trays, and a crowd that's dressed to be seen whether they're floating in the water or holding court in a cabana. Marquee's multilevel layout means there's always a new vantage point, a new bar to post up at, or a new group of dancers to fall in with. It's a daytime party that has no real interest in slowing down until the sun starts to dip.

Table and cabana packages get you the full treatment—dedicated food and drink service, prime real estate by the pool—but general admission still puts you right in the middle of the action. Just remember, this one's strictly a 21-and-up affair.