I live between Rose's Field, a grass strip in Orient, NY and Mattituck, a single paved strip in... uh... Mattituck, NY. It just closed last year. :(
Closest active GA field is Gabresky (KFOK) in Westhampton, NY. Also home to the 106th Rescue Wing of the Air National Guard. Awesome C130's fly out of there!
Even closer is the Calverton Executive Air Park which is the former home of Grumman Aerospace and their F-14 Tomcats. Grumman is long gone but it recently was announced to be the new home of Luminati Aerospace. May see some action there soon!
For commercial, I prefer Islip, NY (KISP) 50 minutes away. KJFK in New York is second choice but an hour and a half away.