I had a great experience with the self guided tour. I had no data/cell signal and this guided tour was spot on where I was located. The Geo sync spoke up when I reached each of the highlight points. As for the park, the views were amazing. I never knew all the details of the Potomac river. The first animal siting was a deer right at the entrance. The 2nd was a woodpecker. The third was an eagle sunbathing, staring right at me 20 feet away. I was in awe of the beauty and majesty. Side note, the park like many others has litter throughout here and there, not real bad. so, bring a bag with you and pick up as you go. the next ones behind you will appreciate the beauty even more. Better yet, do not leave anything behind, leave no trace folks. I loved the park. I followed the River Trail and Gladisville Trail per the guided tour. Great job.