He broke glass on an entry door Saturday at the Bridgeport and Port Jefferson Steamboat Co.
But surveillance video captured the suspect, in shorts and a T-shirt, smoking a cigarette near the scene.
Suffolk County police said the act of criminal mischief occurred at the ferry terminal office on West Broadway between 4:15 a.m. and 11:30 a.m. And police want to know if you recognize the man — and if you do, call Crime Stoppers at 800-220-8477.
All calls will remain confidential. Callers are eligible for a cash reward of up to $5,000 for information leading to an arrest.