Huge Waves pound structures at Miami Beach (above and below left) yesterday during backlash of Atlantic storm that battered coast from Massachusetts to North Carolina. Being hit above is restaurant and lighthouse with Collins Ave. bridge in background. Seas below hammer seawall and cabana lounges at a beach hotel. In photo (below, right) trailer homes at Long Beach Island, N. J. lie strewn like driftwood after floods swirled through the area during the rampaging northeaster.