Slidewaters in Chelan, WA is home to Lakeside Surf, the first US installation of the German-engineered Citywave, which opened in 2021 billed as the world's largest standing wave of its kind. Riders get a glassy, pumped wave built for surfboards and bodyboards, with adjustable intensity that works for progressing intermediates as well as folks still figuring out their pop-up. It fits right in alongside Slidewaters' waterslides and lazy river, making this as much a family water park as a surf destination. And since the wave is pump-driven rather than river-fed, it runs on demand instead of waiting on flows.