The Seabourn Pride is a wonderful ship and their Atlantic coast cruises are wonderful and the autumn is a terrific time to enjoy these locations. You might consider starting with their little '3 Day Cruise to Nowhere ` aka 'Gilligan's Island Cruise' for three days from NY up the Hudson and back in mid-September and then say on for the next leg.
Jane in PHL-devoted to Seabourn Line and joining The Legend Sunday to do the western Mediterranean (done the Carribean, on to new sites)