Long-time favorite out in Hongqiao right here. On the weekends it's usually packed with a rowdy, often boozed up laowai crowd drinking beers and listening to EDM on cheap speakers. During the week, it's a haven for hungover DJs and underemployed English tutors. They're open daily from now until the end of September, 9am to 7pm. Fee is 130rmb for adults or 80rmb for kids. No swimming cap rule, thankfully. Definitely hard to get a seat on the weekend.