Paramount also bought this Great America for a period. Klingons walking around definitely didn't fit with the US historical theming.
Marriott (the original owners) had licensed the Looney Tunes characters for their run. Those were the most fun. One of the last rides built under Marriott was The Edge (drop tower ride). While it didn't really fit the US historical themes, they tied in the Road Runner & Wile E. Coyote to market the ride, which was perfect. The ride was painted orange (drawing on the yellows & oranges used in the desert background paintings of the cartoons). I don't remember if the ride itself had any Road Runner & Wile E. Coyote depictions anywhere, but I remember the cafe next door to it had a Road Runner analog clock with the Road Runner's feet pointing to the hour and minute.