Giant inflatable tubing course slides into Hill Country this summer Slide on down to New Braunfels starting next week for some splashy summer fun. When Texas summers peak to their sweatiest limit and the desire to strip down becomes nearly overwhelming, there’s only one thing to do: hit the slopes — the tubin’ slopes, that is. And this summer, the world’s largest inflatable, slidable tubing course is popping up in the Texas Hill Country for a tubing adventure unlike any other. Slide the Slopes, a traveling “epic” tube experience featuring more than three miles of water-drenched tubing course, will slip into action-sports haven Texas Ski Ranch in New Braunfels for a limited run from Thursday, June 10 through Labor Day, September 6.