Share DTR Dunes Ultramarathon Saturday, April 26, 2025 7:00am – 4:00pm 07:00 – 16:00 Johnathan Dickinson State Park (map) Traverse the 11,000 acres state park. Run through Pine Flatwoods, River swamps, bald cypress, old military base, to the infamous “Dunes of Heaven” and "Dunes of Hell”.