Ferry terminal

An early blip today while I have the time and opportunity. My hotel is very convenient for the Portsmouth to Santander ferry, if you can tolerate 25 hours plus at sea including the Bay of Biscay. They accept dogs so that could be useful.
My flight back is later on this afternoon and this morning I intend visiting the Centro Botín, an arts space on the water front designed by Renzo Piano, and perhaps the Maritime Museum which is a bit further away, so time permitting.