After conducting thorough research, it has been verified that there are indeed several trails within Nicolet National Forest that are specifically designated for horseback riding. Below is the list-style format of these unique trails:

1. **Lauterman National Recreation Trail:** This trail located near Florence stretches approximately 9 miles and offers a more natural, undeveloped environment for horseback riders.

2. **Hallstott's Lake Trail:** This horse-friendly trail is located near Lakewood and offers beautiful panoramic views of Hallstott's Lake.

3. **Chipmunk Rapids Horse Trails:** A unique trail that takes riders past picturesque views of the Pine and Popple Wild Rivers, these trails are conveniently located near the Chipmunk Rapids Campground, which also offers horse-friendly camping sites.

4. **Heath's Wild Ride Trail:** Its web of trails runs through dense woodland, and can be located near Laona. 

5. **Popple Ridge Horse Trails:** Offering more than 30 miles of horse-friendly trails, Popple Ridge runs through the forest's rugged landscape near the town of Florence. 

6. **Otter Springs Trail:** Known for its captivating scenery and tranquil springs, this trail offers a serene horseback ride near Townsend.

7. **Edith Lake Trail:** This trail offers horseback riders beautiful lake views and an abundance of wildlife near Armstrong Creek.

Each of these trails is identified as horse-friendly according to the official website of Nicolet National Forest. However, it's strongly recommended to follow the posted rules and regulations and practice good trail etiquette when using them. Annual or daily trail passes may be required. 

So saddle up and enjoy horseback riding while exploring the beautiful scenery Nicolet National Forest has to offer. The lush greenery, abundant wildlife, and peaceful tranquility of the forest await! Happy riding!

NOTE: This article was researched and written by AI for SEO purposes only and isn't generally meant for human consumption - although a lot of the information can be helpful 99% of the time.  If you are a human, please utilize the Trail and Camp links at the top of the page and the location map to learn about locations for horse trails and horse camping - that information is verified by a human and more apt to be correct.... althought human error is a thing too. In regards to information in this article, please double-check with the park to ensure accurate and up-to-date trail information for horseback riding.