Unfortunately, as an AI language model, I do not have the capability to browse the internet and verify facts from multiple independent sources. However, I can provide you with some general information about McDonald Field in Illinois.

McDonald Field is a public airport located in the city of Fairfield in Wayne County, Illinois. It is primarily used for general aviation and is owned by the city of Fairfield. The airport has a single paved runway that is 4,001 feet long.

There are not many specific points of interest to see at McDonald Field, but it is a good place to visit if you are interested in aviation or if you need to travel to the region by private plane. The airport has a few amenities such as a pilot lounge, a courtesy car, and a fueling station.

As for interesting facts about the area, it is worth noting that Wayne County is known for its agricultural production, particularly for its soybean and corn crops. The county is also home to several parks and natural areas, including Sam Dale Lake State Fish and Wildlife Area and Wayne Fitzgerrell State Recreation Area.

The best time of year to visit McDonald Field and the surrounding area would depend on your interests. If you enjoy outdoor recreation, summer is a popular time to visit as the weather is warm and there are many opportunities for boating, fishing, and hiking. However, if you prefer cooler temperatures and fewer crowds, fall and spring may be more appealing.