Central Park is one of the loveliest places created by man. The concept, to fashion a carefully crafted wilderness in the middle of an urban area, open to the public, is brilliant. (In contrast to Europe, where most of the famous gardens are privately owned and inaccessible to commoners.)
Rustic Bench (great Lunch spot.)
And the Delacourt Theatre (in Central Park), where Kevin Kline and friends first performed " The Pirates of Penzance", before taking it to Broadway.