Unfortunately, as an AI language model, I do not have access to the internet and cannot verify the accuracy of information. However, here is a summary of Manteno County Park based on the information provided:

Manteno County Park is located in the state of Iowa and offers a variety of activities for visitors. Some good reasons to visit include hiking, fishing, boating, and camping. The park is home to several points of interest, such as a nature center, a lake, and a playground. Visitors can also enjoy picnicking and birdwatching.

Interesting facts about the area include its history as a former strip mine site that has been transformed into a recreational area. The park is also known for its diverse ecosystem, with wetlands, woodlands, and prairies.

The best time of year to visit may depend on personal preferences, as the park offers activities year-round. However, some visitors may prefer to visit in the summer months for warmer weather and more outdoor activities.