From its beginning, Millerstown residents enjoyed community-centered leisure activities including sports, music, theater, and outdoor recreation. Hunting and fishing provided family food as well as many tall tales, and the Juniata River drew swimmers, divers, boaters, and skaters. In 1923, Glen Adams Park at the west end of town featured a large slide into the river, swimming areas, swings, pavilions, eating stands, and picnic grounds, while the abandoned canal bed between the town and the river, lined with willow trees and known as The Willows, became a popular picnic spot. Annual fireman's carnivals with amusement-park-type rides and games brought locals together. As early as 1881, Millerstown had a community band. During the 1920s and 1930s, showman C.O. Spangler and family toured Pennsylvania towns offering a Medicine Show complete with miracle elixirs. In the 1930s, minstrel shows, then socially acceptable, provided entertainment, and the Greenwood Players offered theater. Upon his retirement from Greenwood School District in 1977, music teacher and band director Barner Swartz formed the Greenwood Community Band, which still played in 2019. By the 1920s, youth could participate in Boy Scouts and Girl Scout troops and 4-H clubs. Team sports drew both youth and adults, and Greenwood High School teams enjoyed success both regionally and statewide. In 1956, ground was broken for the first swimming pool in Perry County, just outside the borough, and in 2019 it was owned by the Millerstown Recreation Committee. In 2001, resident Valera C. Long left a generous gift to community organizations, all earmarked for the development and maintenance of a park in Millerstown. Working together, these organizations created a beautiful 40-acre facility along the Juniata River providing children's playgrounds, walking, biking, and environmental trails, playing fields for youth sports, picnic pavilions, an amphitheater, and areas for community events. In 2019, the Community Park offered the only public land accessible to the Juniata River in all of Perry County.