Get a Season Pass to Seven Peaks Duneland Waterpark for only $10 on livingsocial – $5 for a daily pass. Season passes expire Labor Day, 2017. Current passholders can extend their pass for another 12 months. 11 water slides, a 650,000-gallon wave pool, and four kiddie attractions. Even once a year pays for itself, since all-day passes are $14.99 at the gate.