Park Map Download The Hillside Lake Park – Park Map is here to show you all the sites and facilities you will need to know about. Here is a quick legend of the site season categories. Sites 1-275 Seasonal Sites (Long Weekend May to October) Sites in the 300’s -10 Month Sites Sites in the 500’s – Mobile Home Year Round Sites Aerial Shots! Check out these new aerial shots of Hillside Lake Park! These photos were taken in 2020.