Promising "the ultimate family destination", the cruise line's private islands will include locations in the Caribbean, Asia and Australia.
Royal Caribbean is known for cruise ships with novel features ranging from robot bartenders and surf and skydiving simulators to what it claims is the highest water slide at sea.
And now it has land in its sights with the launch of its new Perfect Day Island Collection, a series of private islands for use by its cruise passengers.
The first will be Perfect Day at CocoCay, its existing private island in the Bahamas, which will undergo a $US200 million ($260 million) overhaul.
"When you name a place Perfect Day, you're making a big, bold claim, but it's one we're going to deliver on," Royal Caribbean International president and chief executive Michael Bayley said.
Royal Caribbean ships departing from the US States of New York, Maryland and Florida will call at CocoCay, which Mr Bayley said would become "the ultimate family destination in the Caribbean".
CocoCay will include a waterpark with 13 slides, including the 41m-tall Daredevil's Peak, along with a 480m zip line that will be up to 15m high and a helium balloon that will float up to 137m above the ground.
There will also be Oasis Lagoon, billed as the Caribbean's biggest freshwater pool, and beaches with cabanas, daybeds and activities including volleyball, beachside basketball, soccer, paddle-boarding and glass-bottom kayaking.
The renovations will begin from September, with most of the new experiences set to open by early 2019. Coco Beach Club, which will have what's said to be the first over-water cabanas in the Bahamas, will open in November 2019.
Royal Caribbean said that additional Perfect Day islands in the Caribbean, Asia and Australia would be announced "at a later date".
The cruise line is set to launch the world's biggest cruise ship, Symphony of the Seas, in April.
It has also announced it will spend $US900 million on fleet modernisation - adding new features such as Sky Pad, a virtual-reality bungee trampoline experience - to ships including Mariner and Navigator of the Seas.
- For more, go to royalcaribbean.com/perfectdaycococay.
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