Hours: Architectural cruises depart daily at 10, noon, 2 and 4, late Mar.-early Dec. (also at 11 and 1, early May-early Oct.). Cocktail architectural cruises depart Mon.-Sat. at 6 p.m. and 8 p.m., late May-early Sept.; Fri.-Sat. at 6 p.m., early Sept.-early Oct. History cruises depart Fri.-Sun. at 3, late May-early Sept.