Round Rock, Texas, will be a major attraction starting in 2020 when a new convention center, graced by the world's largest indoor water park, opens. Kalahari Resorts is building a $550 million, 345.2-acre complex that will include 1,000 guest rooms; between 150,000 and 200,000 sq. ft. of meeting space; outdoor pools; five restaurants; a spa; arcade; and retail space. Groundbreaking took place on May 15. The facility is scheduled to open in 2020. The 200,000-sq.-ft.