Not very much to see here. It is sort of an urban park but with a bit of nature mixed in. On one side, the Anheuser-Busch brewery buildings, and on the other, the United States Arsenal grounds (now an active U.S. Air Force facility). Parking is free, but be careful where you park...apparently balls can come toward your window. Most people usually come here for softball games or practice (there are two ball fields), soccer, kite-flying and dog-walking. There is an asphalt trail, which to some people is probably not long enough. Restrooms are available (though they are locked most of the time...), as well as a fountain (well, supposedly...I've never seen it run before).
For those wondering about the history of the park, it is named after Union Civil War General Nathaniel Lyon, the first general to be killed in the American Civil War. He is buried in his home state Connecticut, but a statue of him as well as a monument are at Lyon Park. The park was created in 1869 under the condition that the city would a monument be created for Lyon. That monument was dedicated in 1874. Though not open to the public, the Arsenal grounds contain buildings that were used during the Civil War. So historically, there's some cool information about Lyon Park. But otherwise, this is usually a chill-spot for people who live nearby or who work at Anheuser-Busch InBev. read more