A client recently asked us this question, as they have fear of flying…
Here were our thoughts:
A cruise is the most viable option and take a couple weeks to get there.
Hitching a ride on a cargo ship or ferry is also an option, may take longer, basic amenities and limited availability.
There’s always the private craft route.
You may be able to pay your way onto a research vessel.
Sailors look for crew(hands) and may enjoy the company. How are your Sea-Legs? You can find these on various sailing forums and marinas sometimes have lists or can recommend where to connect with others. This will probably be the least cost prohibitive but will require teamwork to some degree.
It really comes down to time being the largest factor. Funds can vary widely but there’s a boat out there for you somewhere.
If going straight to Japan you’ll most likely be departing from the West Coast(LA/Vancouver/Seattle). Europe, East Coast(NY/maybe Miami).