Swallow Falls State Park: One of the most popular parks in Maryland, it has a hiking trail through an old-growth hemlock grove, down to the mighty Youghiogheny River, or Yough, pronounced “the Yoc,” for short. The park features the unfortunately-named Muddy Creek and the 53-foot Muddy Creek waterfall, the highest in the state. A wooden staircase takes you down to the confluence of Muddy Creek and the Yough, and from there the trail runs above the big river, with a couple of scenic overlooks, then loops back toward the upper ridge and the parking lot. If the water’s up in the Yough, you’re likely to see white-water kayakers plow through the rapids on their way downstream — and, odd as it might seem, downstream means north toward Pennsylvania. A second trail runs along the eastern side of the Yough. It does not attract as many hikers as the main trail, but offers some delicious views of the big river and some cool rock formations. The parking lot for the eastern trail access is outside the main entrance, on Swallow Falls Road, near the steel bridge over the Yough.