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 are 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, XS can afford a lot of lasers. XS is open Friday through Monday from 10am to 4am.