Not really, there were a good number of water parks of the same style that pre-dated Wet n Wild that were built in the mid to late 60s. Few survived more than 10 years. River Country opened 9 months earlier than Wet n Wild. The Lake Dolores Waterpark in California opened in 1962 and is generally considered the first documented modern style water park in America to open. Wet n Wild is/was likely the oldest "continually running" water park in America.