Stopped there on a long drive once for an hour or so and the kids liked it:
Mountain bikes, boats and fishing poles are really just toys for grown-ups; so go be a kid again. After all, we've got plenty of trails for getting mud on those tires, including those in Guernsey, Buffalo Bill and Curt Gowdy State Parks. If making a splash is more your style, we've got space for...
https://wyoparks.wyo.gov/index.php/places-to-go/wyoming-territorial-prison