WOODBURY - This holiday weekend, police will be out in full force on Long Island roads, looking for drunken and aggressive drivers. Police will set up sobriety checkpoints across the Island, while officers from the Marine Bureau will keep an eye out for drunken boaters.Those who want to avoid drinking and driving will be able to take advantage of additional trains provided by the Long Island Rail Road during the long Fourth of July weekend. Extra eastbound trains will leave Penn Station starting just after 2 p.m. tomorrow. There will also be extra trains to the East End.LIRR Holiday Schedule