Unfortunately, as an AI language model, I do not have access to real-time information or the internet to verify the accuracy of the information provided. However, I can provide you with a general summary of the Mount Marty Park in the state of Missouri based on the available information.

Mount Marty Park is a public park located in Yankton, South Dakota, not in the state of Missouri as stated in the prompt. The park is known for its scenic views of the Missouri River and offers several recreational activities, including hiking, fishing, camping, and picnicking.

Some of the specific points of interest in the park include the hiking trails that offer views of the river and the surrounding landscape, the historic Garretson Stone Arch Bridge that spans the river, the fishing opportunities in the river, and the campground that offers campsites and cabins for rent.

Interesting facts about the area include its historical significance as a trading post and the site of several Native American battles. The park is also home to a variety of wildlife, including bald eagles, deer, and coyotes.

The best time of year to visit the park is during the summer months when the weather is warm and the park offers the most activities. However, the fall season also offers stunning views of the changing colors of the leaves.

In conclusion, Mount Marty Park in Yankton, South Dakota, is a popular destination for outdoor enthusiasts and nature lovers. It offers several recreational activities, scenic views, and historical significance, making it a must-visit location in the area.