From the center of Vernal, go north on Vernal Ave., turn east on 500 North; at the Y go left toward Diamond Mtn., turn right on the Brush Creek Rd., turn left on the Island Park Rd. It's about 30 miles from Vernal.
Island Park is an area within Dinosaur National Monument, Utah. The Green River runs through it, and dirt roads access it. It has abundant wildlife, an old homestead, and few visitors.