You can also book rooms on some container ships (yes, container ship cruises are a thing!). The downsides of such a cruise are readily apparent: Lack of amenit

You can also book rooms on some container ships (yes, container ship cruises are a thing!). The downsides of such a cruise are readily apparent: Lack of amenities during the cruise, few to no people to talk to/with (unless you know the common language of the crew - which could be almost anything - but even then, they have work to do!), etc. You are also limited on where you can travel from and to, and of course when you arrive at your destination, you probably have to get creative to gain transport from there to wherever. There's also the fact that you won't usually have a set and known time for when to board the ship for leaving (it might be in port and scheduled to leave at a certain time, but might be held up for one reason or another outside of the port, or delayed leaving for some reason or another), or when it will arrive at its destination (like any ship, I suppose - but container ships are working vessels, and they may be held out of port for certain admin purposes, or some other law-related reason, or they may have to dock elsewhere for repairs - or who knows what else). That all said, from what I have investigated, if you want a little (or a potentially a lot) of adventure, and don't mind the whole uncertainness of the experience, container ship cruising can be a very inexpensive (compared to a regular cruise ship). I don't think it compares to flying (but I never delved that deep into the pricing), but it certainly could be worth it from an "about my vacation" story perspective.