Buffalo River State Park is a 2.5 mile loop trail located near Glyndon, MN and is good for all skill levels. The trail is primarily used for hiking and is accessible year-round.
only 10 miles out of Fargo so that's a plus, but nothing special.. pretty much flat and mix of grassland and prairie trees
There are more trails available than the 2.5 miles indicated.
I did 7.5 miles last weekend. They are not at all challenging and many are along and/or though grassland areas. None-the-less, it was pretty.