Way above the throngs choking Xijie, Mojo Bar – on the 6th floor and roof of the Alshan Hotel – has the most amazing outdoor terrace with wraparound views of the Avatar-like karst landscape. It's regarded as the place to kick on into the night, with pool and cheap beer (Tsingtao ¥20): it's where things get loose late in the evening.
Find your way to No 18 Xijie, the Alshan Hotel, and take the lift to the 4th floor before walking up the last two flights to Mojo Bar.