I know you checked with some freighters, but some do accept passengers. While they are not geared towards tourists (there are few amenities, you eat in the crew mess, etc.) you will get your own cabin
and they are very flexible about dogs as long as you can keep them in cabin
except for leashed walks on deck
Here are sites that help book travel on commercial
Maris Freighter Cruise and Travel Club -- Around the World Cargo Cruises
Cruising the world by freighter
There are numerous other resources. Google
"Traveling on a freighter as a passenger" for more info. It's probably your best bet.
You would need to identify which cargo ships routinely service
the islands you want to travel to, and then figure out how to contact them for passenger service. Many more ships have passenger service than register with these agents.
It's very difficult and expensive to charter
a crewed vessel to take you there. They do exist, but you'd be looking at a very large expense.
You could potentially bareboat charter
a yacht and then separately pay a delivery skipper
to take you there. This might actually be the least expensive route
captains are relatively easy to find, and bareboat
charters in the caribbean
are very easy to find although they do have numerous restrictions regarding where you can travel.
This would cost you on the order of $1500 per day for the trip there and the same for the delivery captain
to return the boat. The trip calculator on Bookings.com reports $9500 in charter and fuel
costs for the one-way trip, you would need to double that for the round trip and then add the cost of the delivery captain
, at $300 to $500 per day. Figuring 15 days, you'd be upwards of $25,000 total to charter.