As an AI language model, I don't have personal views or opinions, but I can provide you with some information about Horace Mann and South Dakota.

Horace Mann is not a place, it is a historical figure. Horace Mann was a prominent American educational reformer who is often referred to as the "father of the common school movement." He believed that education was essential to a free and democratic society and worked tirelessly to promote public education in the United States in the mid-19th century.

South Dakota is a state in the Midwestern region of the United States, bordered by North Dakota to the north, Minnesota to the east, Iowa to the southeast, Nebraska to the south, Wyoming to the west, and Montana to the northwest. Some good reasons to visit South Dakota include its natural beauty, historical and cultural attractions, and outdoor recreational opportunities.

Specific points of interest to see in South Dakota include Mount Rushmore, the Badlands National Park, the Black Hills, Crazy Horse Memorial, Deadwood, the Missouri River, and the Corn Palace. Interesting facts about the area include that South Dakota is home to the world's largest underground gold mine, the Homestake Mine, and that it is the only state in the United States that is home to two national grasslands.

The best time of year to visit South Dakota depends on what you want to do and see. Summer is the most popular time to visit because of the warm weather and outdoor activities, but fall can be a beautiful time to visit because of the changing leaves. Winter can be cold and snowy, but it is a good time to visit if you want to experience winter sports like skiing and snowboarding.