Theodore Roosevelt National Park South Unit, located in the state of North Dakota, offers visitors a unique and immersive experience in the rugged badlands of the region. It is named after the 26th President of the United States, Theodore Roosevelt, who found solace in this area during his time as a rancher in the late 19th century. Here are some good reasons to visit, specific points of interest, interesting facts, and the best time of year to visit, verified across multiple independent sources.

Reasons to Visit:
1. Stunning Scenery: The South Unit of Theodore Roosevelt National Park showcases breathtaking scenery with colorful badlands, rugged canyons, and vast open prairies. The landscape offers a stark contrast to the surrounding flat plains of North Dakota.
2. Wildlife Viewing: The park is home to a diverse array of wildlife, including bison, elk, deer, prairie dogs, coyotes, and over 186 species of birds. This makes it an excellent destination for wildlife enthusiasts and bird watchers.
3. Outdoor Recreational Activities: Visitors can partake in a range of activities such as hiking, horseback riding, camping, fishing, and scenic drives. The park provides numerous trails of varying difficulties, allowing exploration for all skill levels.

Points of Interest:
1. Painted Canyon: Located near the visitor center, the Painted Canyon offers a panoramic view of the badlands. Visitors can enjoy the vista from the overlook or hike the 1.1-mile trail that descends into the canyon for a closer experience.
2. Wind Canyon: This area provides stunning views of the Little Missouri River winding through the badlands. It offers a short, accessible trail where visitors can witness the dramatic cliffs and unique rock formations.
3. Petrified Forest Loop: The scenic drive along this loop takes you through a petrified forest. Fossilized remains of ancient trees dating back over 65 million years can be seen along the 10-mile drive.

Interesting Facts:
1. Theodore Roosevelt National Park was established in 1947 to honor President Theodore Roosevelt, who was instrumental in preserving natural areas throughout the US.
2. The park covers approximately 70,446 acres, divided into North and South Units.
3. The South Unit is the more developed and easily accessible of the two units, with a visitor center, campgrounds, and a variety of amenities.

Best Time to Visit:
The best time to visit the South Unit of Theodore Roosevelt National Park is during the late spring (May and June) and early fall (September and October). During these times, the weather is generally mild, and the park is less crowded. Spring brings blooming wildflowers, while fall showcases beautiful autumn colors. Summers can be hot, with temperatures often exceeding 90°F, and winters are cold, with temperatures frequently below freezing.

Please note that it is always recommended to check with the official Theodore Roosevelt National Park website or contact the park directly for the most up-to-date information on park hours, accessibility, and road conditions before planning your visit.