Diamond Hill Park is truly Cumberland’s diamond in the rough. A former ski area, it is now home to 3.8 miles of marked invigorating trails up the 350-foot rise of “The Big Hill.” The park gets its name from its mica-laden rocks glittering in the sunlight. Trails are color-coded to match the map so you will always know where you are. After your hike take a rest by the pond near the bandstand. It is a venue for many popular events including the summertime “Cumberland Fest” carnival and fair, and “Haunted Hill” in the fall. The Town hopes you enjoy your day in the park.

From Diamond Hill Park Trail Map

The mountain-biking website, TrailForks, notes that there are two parts of the park. There is the town-owned ski hill side, which is the actual park, and consists of the pump track, some hiking trails/singletrack, and classic New England tech trails. On the other side are the harder "famous" flow trails with jumps and drops.

Diamond Hill is a large hill on Diamond Hill Road in Cumberland, Rhode Island, which contains a town park and a former ski area. The summit is 481 feet above sea level. On a clear day, the Boston skyline and Mount Wachusett are visible.

Diamond Hill is a massive outcropping of white quartz with a vertical drop of 350 feet. The hill was named in colonial times and takes its name "from its sparkling and shining appearance." In 1935 "Philip Allen, C. Faulkner Kendall, and Henry Munroe Rogers offered 235 acres of land on the hill to the State of Rhode Island" and ski trails were cut shortly thereafter.

In the twentieth century, the hill contained two small ski areas, Ski Valley (operating from 1939 to 1981) and Diamond Hill Reservation (operating from the mid-1960s to mid-1980s). In 1939 when the first ski area opened, it was a hike-up and ski-down facility, but operators of the ski areas eventually constructed rope tows, a T-bar, and multiple two-person chair lifts. In the 1980s the ski areas were closed. In 1997 the town of Cumberland acquired Diamond Hill from the State. The hill is now a 373-acre town park and is the starting point of the thirty-three-mile Warner Trail. The park features athletic fields, picnic areas, 3.8 miles of hiking trails, and a bandstand near the pond.

The AllTrails.com website has descriptions of three trails in the Diamond Hill parks.