Finding the right ship when its the right time won't be difficult, the port is small enough. But trying to figure out the shipping schedules in the Caribbean port town of Bluefields in any language is going to be a challenge. My adventure was taking me to the Corn Islands and finding the Captain-D cargo ship for my transit involved ignoring the schedule on Bluefields tourist site, the Corn Islands' "getting here" page, and the schedule at the connection in Managua. Pick up the phone and talk to the captain and good luck. Otherwise, prayer may be your only hope.