John K
Google
This park is located just 20 minutes from Mukdahan. As a foreigner, I paid 100b entry. Visited on a Saturday, so there were a fair number of visitors. There's a large parking lot with some souvenir sellers and a few shops with drinks, but no cooked foods - you must bring your own. Several public toilet areas. You can wander around on the nearby cliffs and snap some photos, or you can take a walk on the nature trail. Out and back, it's a total of 6 km to walk to a waterfall, cliffs, and a scenic overlook. 7 km if you add a side trip to another waterfall. Be aware that although there are a few rest areas under shaded pavilions, the trail is exposed to the sun most of the way, and it gets hot walking around on the black rocks. Overall it's a very interesting geological formation in a clean and well maintained park.