240 volt AC. It is advisable to take an international adaptor.
There are many different forms of travel within Fiji, they are as follows:
Internal flights - The most expensive way to travel between islands is by plane and there are many domestic operators servicing all of the island groups.
Ferries are inexpensive, frequent, reliable and very sea worthy and mixing with the local people while travelling between islands is an interesting part of the Fiji experience.
Bus - the larger islands have good bus networks and outside the towns you can often just hail down a bus wherever you see one.