Short Cruises From Northern Cali I Want A Short Cruise Or Ferry Trip From Dover Engalnd?

I want a short cruise or ferry trip from Dover Engalnd? - short cruises from northern cali

I've never been on a cruise or a ferry passenger, but I think it would be good to have a more Dover, but is it possible? People go out on a ferry for the trip and back then? I do not drive so it would be a train. Is it worth it or I expect something that does not exist? Are not even in Dover, everywhere is easily accessible from London.