The Royal Caribbean Cruise Lines vessel the Serenade of the Seas , with 2,100 passengers and 891 crew, visits Rockland Harbor for its inaugural port of call visit Sunday, Oct. 4. Her sister ship Brilliance of the Seas made her inaugural port of call visit to Rockland Harbor earlier this month. Serenade of the Seas is on a 12-night “Fall Foliage Cruise” starting in Quebec City, Canada, and ending in Cape Liberty, N.J., with stops in the Maine ports of Bar Harbor, Rockland and Portland.