Unfortunately, Adelphi Community Park is not located in the state of District of Columbia. After conducting research on multiple independent sources, it appears that Adelphi Community Park is actually located in Adelphi, Maryland, which is a suburb of Washington, D.C.

Adelphi Community Park is a popular destination for locals and visitors alike. It offers a variety of recreational activities, including hiking trails, sports fields, playgrounds, and picnic areas. Visitors can also take advantage of the park's amenities, such as restrooms, grills, and parking.

One of the main points of interest in Adelphi Community Park is the Anacostia Tributary Trail System, which runs through the park. This trail system connects multiple parks in the area and offers scenic views of the surrounding nature.

Another interesting feature of the park is the community garden, which allows locals to grow their own fruits and vegetables. The garden is maintained by volunteers and offers a peaceful and relaxing atmosphere.

Adelphi Community Park is open year-round, but the best time to visit is during the spring and fall months when the weather is mild and the foliage is at its peak. Additionally, visitors should be aware that the park can be crowded during peak hours, so it is best to plan accordingly.