Thanks for all the responses. I finally heard from the Nicaraguan Consulate in Miami that answered many questions except how much a visa costs, how to pay for it, and if you even need a visa if you stay on the ship (San Juan Del Sur). Waiting for a reply and hopefully get one.
Below is the response I received for applying for a visa (translated from Spanish with Google translate). Also, I attached the application form.
Good afternoon,
The visa application form and requirements are attached.
To apply for a visa, please complete the requirements 1 month prior to your travel date.
The requirements to apply for a visa are the following:
1. Fill out the application form
2. 1 passport size photo with white background
3. Copy of the passport data page, at the time of travel it must be valid for 6 months or more
4. Copy on both sides of the current residence
5. Visa application letter, explaining the reason for your trip, date of entry and exit, details of where you will be staying, if you are a family, name of the person, address, ID and contact telephone number.
6. Bank statement of the last month of the applicant.
You must apply for a visa four weeks in advance, preferable to buy a ticket until you receive an answer.
You can send the paperwork by postal mail 1332 West Flagler st, Miami Fl 33135
FORMULARIO VISA VCA-4.pdf