Like the Irish resort crowds of old, streams of people seeking relief from the hot city spill off the A train and march down Beach 116th Street — just two blocks on the skinny Rockaway Peninsula — to the cool shore. Want to spend the weekend? The huge Boardwalk hotels, dating to the 1830s, are gone, but the D Piper Inn has quaint rooms ($125 a day, $650 a week), open porches with ocean breezes, and gas grills on the patio out back.
