Sorry, there seems to be an error in the prompt. Louisiana State Park Site 15 is not located in the state of Texas, but rather in Louisiana. However, I can provide a summary about Louisiana State Park Site 15, which is located in West Feliciana Parish, Louisiana.

Louisiana State Park Site 15 is a popular destination for nature enthusiasts, hikers, and history buffs. The park is home to a variety of scenic trails, including the Wild Azalea Trail, which is the longest hiking trail in Louisiana, spanning over 26 miles. Visitors can also explore the park's two historic sites, the Magnolia Plantation and the Kent Plantation House, which provide a glimpse into Louisiana's rich history.

In addition to its scenic trails and historic sites, Louisiana State Park Site 15 also offers a variety of recreational activities, including fishing, camping, and picnicking. The park is home to several campgrounds, which offer both camping and RV sites, as well as cabins for rent.

The best time to visit Louisiana State Park Site 15 is during the spring or fall, when the weather is mild and the park's flora and fauna are at their most vibrant. The park is open year-round, but temperatures can be hot and humid during the summer months.

Overall, Louisiana State Park Site 15 is a must-visit destination for anyone looking to explore Louisiana's natural beauty and rich history.