"Makoshika," derived from the Lakota word for "bad land," is the largest and arguably baddest state park in Montana, sprawling over more than 11,000 acres of weirdly eroded eastern Montana, the state's analog to neighboring South Dakota's better known Badlands National Park.
Makoshika lies along the Montana Dinosaur Trail, and features an interpretive center featuring triceratops skulls and other fossils from early park residents including Tyrannosaurus rex. The park's somewhat incongruous second main feature is an 18-hole frisbee-golf course, widely considered one of the most difficult folf layouts in the country.
Otherwise, Makoshika offers a pretty typical, if expansive, lineup of state park-style amenities, including an archery range, several scenic drives, a 16-site campground, and outdoor amphitheater.
Be aware that metal detectors, digging, collecting and removal of artifacts are prohibited.