You can not play in Destiny Islands, like in almost all other Kingdom Hearts games, however, many important cutscenes do take place in Destiny Islands.
Because the darkness already swallowed it.
Yes. Sora and Riku both visit Destiny Islands later in the game. Sora visits the Destiny Islands world card and finds the truth about Namine and kairi, after defeating a Darkside Heartless. Riku visits Destiny Islands when Zexion creates his own version of Destiny Islands and tries to defeat Riku using an illusion of Sora. Zexion (as Sora) tells Riku that he is a dark monster and that the light will destroy him. Riku is on the verge of giving up, when Namine (pretending to be Kairi) convinces him to use both darkness and light).
Worlds yes. Island you can't visit freely.
To learn there future or their destiny
The easiest way to level up on the video game Destiny is to visit the bounty tracker.
The real island where they stayed was with the name, 'Kensuke's Kingdom'.
The island of misfit toys.
You can't visit Monito, there are no natural landing zones and going on the island is forbidden.
A passport.
Tiresias
Lydia was Croesus' kingdom. For more information, visit the Related Link.
Puerto Rico is the name of the Caribbean island you visit on your fourth stop.