Sandcastle Waterpark brings Boardwalk vibes to the banks of Pittsburgh's Monongahela River for refreshing family fun. The 60-acre park opened in 1989 and today offers more than a dozen different water slides, including the new, thrilling Bombs Away drop slide. Better, Brighter and Fresher Than Ever after parkwide enhancements, guests can enjoy a splash in the scenic Mushroom Pool and wild Mon-Tsunami Wave Pool, and relax with delicious drink and snacks.