Join Our Park Ambassadors! Our parks are enjoyed by thousands of guests each weekend. Park Ambassadors play a crucial role in enhancing the visitor experience, boosting environmental education, and promoting the Litter Ends With Us campaign. We are looking for good-natured volunteers to share their appreciation for natural environment with our visitors on the weekends throughout Oak Grove Park. Training, materials, and equipment will be provided, including a new Litter Ends With Us branded electric utility cart! Email Cindy Harris at Charris@grapevinetexas.gov with questions.