Gillian's Island & Water Park offers two exciting parks with 35 family rides plus water slides including an 8,800-square-foot water-spraying playground. When it comes to splashing, wet fun in the sun, the park is just the place to come and play. With a great variety of slides, rides, and water activities, everyone - from the speed demons to the little ones - will be thrilled at Gillian's Island. Seasonal.