Armstrong-Kelley Park is the largest private park open to the public on Cape Cod. It is located in Osterville across from Fancy's Market. The land was donated in 1930 by two sisters to the Cape Cod Horticultural Society. The park features rare trees, theme gardens, walking trails, and fairy houses. It is maintained by volunteers and hosts community events. A new addition called "Buddy's Place" was created for dogs and their owners.