Wynn Social knows how to make nightlife in Vegas! Was at XS a total of 4 times during our holiday because their lineup was so good!
The best night is Sunday Swim Night. So bring your bikini and party. The sound is good that night because the DJ is facing towards the pool, and not inside the club.
The other nights, the DJ is facing inside the club, so either get their early enough to get inside, or just hang out outside and gamble. The blackjack dealers there were really patient and were helpful if you were unsure to hit or stay.