After extensive research, it's clear that Fishlake National Forest offers a multitude of opportunities for equestrian enthusiasts. Please find below a list of specifically horse-friendly trails in this area:

1. **Fish Lake Basin Trail**: This trail system goes around Fish Lake and offers splendid vistas of the lake and its surroundings. Horses are permitted on the trail, thereby making it popular among local riders.

2. **Bullion Canyon Trail**: Known for its historic artifacts from Utah's mining era, this trail also welcomes horses. It allows you to take in the beautiful forest setting while riding your horse.

3. **Paiute Trail System**: One of the most renowned trail systems in the USA, the majority of the Paiute Trail system is open to horse riding. This trail lets you explore everything from dense forests to open meadows, all on horseback.

4. **Mount Marvine Trail**: This trail provides a stunning view of the mountain range and lush vegetation and is indeed open for horseback riding.

5. **Monroe Mountain Trail**: This trail is also accessible to horses, providing panoramic views of the Fishlake National forest's vast expanse.

6. **Richfield Ranger District**: While not a specific trail, this district is known for having multiple trails that permit horseback riding, offering varying lengths and levels of difficulty for riders of all experiences.

**NOTE:** Always check with the local trail authorities or Forest Service offices for the latest rules and regulations, as conditions and rules may change over time. Enjoy your horse-riding excursion in Fishlake National Forest, but remember to prioritize the safety of both yourself and the wildlife. 

And remember, "Take only photographs, leave only hoofprints."

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.