Boulevard pools is the largest of the three. Answer 1 of 7: Hey, Heading to Vegas in September and staying at the cosmo. Also at the pool is The Yard, a fun hang out space offering ping pong, foosball and pool tables. There are three pools to choose from in The pool district at The Cosmopolitan Las Vegas. A wading pools is perfect for little tots. Overlooking the heart of the Strip, the Cosmopolitan's district of three distinct Las Vegas pool experiences: Boulevard Pool, Bamboo Pool, and Marquee Dayclub Pool. Choose to Party poolside with DJ’s or sunbathe in a relaxing environment. Assuming will still be pool weather then and despite protests from my husband, me, my friend and her partner want to experience a pool party! These are the Boulevard Pool, The Chelsea Pool and the Marquee Dayclub pool.