A nude cruise is due to set sail in February next year from Miami around the Caribbean — but passengers must follow specific rules about nudity.

The Big Nude Boat is a partnership between Norwegian Cruise Line and Bare Necessities, a specialist nude cruise travel company.

It can take up to 2,300 passengers, and the company describes the trip as a "stress-free, clothes-free experience."

Over the course of 11 days, it'll take visitors to spots like Puerto Rico, the Bahamas, St Lucia, and Martinique, as well as reserve three days for a "Nude Day at Sea."

Cabin prices start at $2,000 per person for a two-person cabin and reach up to $33,155 per person for a three-bedroom 'garden villa' room. The ship, Norwegian Pearl, also has 16 dining options, 14 bars and lounges, a casino, and a spa.

Bare Necessities says it wants to "break down the barriers against social nudity and make clothing-optional vacationing a viable and acceptable option for all," per its website.

But that does mean that the cruise has specific rules about nudity, including strictly forbidding any photos being taken of passengers without their consent.

At all times, passengers must avoid putting their naked butt on any surface. This is, according to the company guidebook, "standard nudist etiquette."

They also need to wait for the ship to leave the dock before whipping off their clothes and must cover up if port authorities board the vessel.

While dining rooms have a mandatory clothes-on policy, passengers can bare all at the self-service buffet area.

This cruise is different from adult-lifestyle cruises, or so-called "swingers cruises," which attract passengers specifically looking for a more "sexually adventurous" vacation.

Bare Necessities says that "social nudity is not a sexual activity." And its policies prohibit "fondling or inappropriate touching," and "lingerie, fetish-wear, and excessive genital jewelry."

"Nudism is about leaving judgment behind," a vice president of sales at Bare Necessities previously told Business Insider.

The VP said the captain and the crew on these cruises are not nude. Instead, they are responsible for doing their typical day jobs and ensuring the dress codes are enforced.

"Our first day aboard is always a little bit of a shock for the crew, but after that it's fun for everyone," Whitmire said.