As the abbreviated name suggests, this gold-plated crown jewel of Wynn nightlife is excessive. A recent $10-million redesign upgraded the entire space (both the inside area and its outdoor pool deck) to include a pyrotechnic system that shoots flames above the pool, and added a DJ booth with 14,000 LED lights, moveable video screens, and more lasers. An update like this costs a pretty penny, but as the highest grossing nightclub in the country (thanks to the contributions of appreciative visitors like yourself), XS can afford lots of lasers. XS is open Friday through Monday from 10pm to 4am.