We spent the whole day hiking the Black Hills National Forest area just north of Sundance Wyoming were we stayed during our trip. The forest was very pretty. The national forests seem to sit in these isolated hills above the plains. There is a series of trails that go all over the forest.
Once you get up in the forest the views are very exciting.
All the wildflowers were in bloom on every trail
Don't know if they were aspen or birch trees, but they lined the trail for awhile and made a great corridor of hiking
More far reaching views