Escape the heat at the Neapolitan, a refreshing air-conditioned bar in the midst of the Cosmopolitan’s sunny Boulevard Pool deck. Treats by mixologist Chris Hopkins include cool spiked sweets, adult ice cream sundaes and ice pops, and liquid nitrogen sorbets. Pace yourself or go full force and embrace that boozy headache. Cosmopolitan, 698-7000. Daily, noon-6 p.m.; extended hours during special events.