I just love Appalachian Trail Hiking there is a pleasure, 
What is that?
The Appalachian National Scenic Trail is a hiking trail in Eastern US, it extends from Georgia to Maine.
What does one do on a hiking trip?
A trail is usually a path or some kind of track  where you can hike, it's basically just walking but in nature specifically.
Ok cool, are there others but the one you mentioned?
There is for example Waitukubuli trail located in the Caribbean Dominica Island, it's really long, like 115 miles.
Oh nice, so there are hiking trails all over the world!