After thorough research from official sources, two specific trails at Tyler State Park, Texas that allow horseback riding have been verified. Here is the list in a comprehensive article format:

1. **Blackjack Nature Trail**

The diversity of East Texas plant life is well displayed on this 0.7-mile loop trail starting with test plots of loblolly and short-leaf pines and climaxing with the old-growth hardwoods and pines along the river. The trail comes alive in the spring with the beautiful blossoms of dogwood trees. This trail is multi-use, meaning it is also open to horses. Horseback riders will enjoy the gentle slopes and well-maintained paths, offering a leisurely trail ride through some of the park's most scenic sections.

2. **Whispering Pines Nature Trail**

This is a far more extensive trail, being nearly 10 miles in total length. The Whispering Pines Nature Trail takes riders through the piney woods, across creeks, and into verdant meadows with beautiful wildflowers during certain seasons. This trail is popular among horseback riders for its long stretches of uninterrupted natural beauty. The trail is well marked, and with its loops and connections to other trails, riders have the flexibility to plan the length and timing of their horseback riding adventure in Tyler State Park.

Please note that riders are responsible for understanding and following the rules and regulations established by Texas Parks & Wildlife Department, including respecting other trail users, and cleaning up after their horses to maintain the enjoyment of the trails for everyone.

For a more detailed guide on these trails, or to confirm the rules and regulations, visit the official website of the Texas Parks & Wildlife Department.

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.