There are two amazing national forests that compete for my top ratings, the Redwood and the Ouachita.
Yes, Yellowstone is amazing, but the Ouachita shares a similar quiet awe with the giant redwoods.
The trees are not as tall of course as a redwood, but the unique diversity of the Ouachita National Forest and it's many ectones make for some of the most unusual rock formations, animal and plant life.
The trails in my opinion are the best in the country! Well maintained often by local volunteers, and many are handicap accessible.
Other trails for horses, mountain bikes and more are available along with free shelters when you get in deep.
Hike for days or weeks, loose yourself in the wilderness. This forest will steal your heart.