(5:33 p.m. EDT) -- Royal Caribbean has unveiled a series of new four-night itineraries on Navigator of the Seas and Mariner of the Seas, each featuring two separate days on Perfect Day at CocoCay, Royal Caribbean's upgraded private island experience in the Bahamas. Navigator of the Seas will also sail three special voyages with extended nighttime hours on the island.

The nearly 40 new two-call itineraries, which begin September 30, see the ships departing Miami and Port Canaveral respectively, calling on CocoCay on Day 2, followed by a stop in Nassau on Day 3. Ships then return to CocoCay on Day 4 before heading back to their respective homeports.

Special nighttime activities on Navigator's three extended-hours voyages include a Bahamian-inspired Junkanoo Jam Up Party, an island barbecue, and performances by a calypso band and fire dancers. To cap off the night, a fireworks farewell will greet cruisers before their ship sets sail.

"... the resounding feedback from our guests is that they want more -- more time and even more ways to experience [Perfect Day at CocoDay]," Michael Bayley, president and CEO, Royal Caribbean International, said in a statement. 

Royal Caribbean's newly renovated Perfect Day at CocoCay is home to the tallest water slide in North America and the "Up, Up & Away" helium balloon attraction, which rises up to 450 feet in the air. The island also boasts white-sand beaches and the Caribbean's largest freshwater pool.