The Summer Heat Is Pushing Up Revenues For Wetlands Water Park In Jonesborough. In Past Years, The Water Park Has Seen Its Revenue Decline. Rachel Conger, Director Of Parks And Recreation For Tennessee’s Oldest Town, Said The Weather Has A Large Impact On Attendance Numbers To The Popular Attraction. With The Recent Heat Wave, Sales Are Up This Year By 30-Percent. The Park Will Switch To Weekends Only In August And Then Close For The Season On Labor Day.