Viti Levu - the main Island of the Fiji group - is pretty goo cycling. Probably about 4-500km round the outside. The road is all tar sealed except for s few kilometres in rural areas. We are looking at a "Round Viti Levu" cycle later this year. Theres heaps of hotels ranging fro budget/backpacker to 5 star. Have a look a at BulaFiji.com. The weather is warm ALL year round but it does rain a lot especially on the Eastern side of the island. If you want I'd be happy to get more information.
Hey a "Round Viti Levu" cycle sounds fantastic. Keep us posted on when, where and how much. Always looking to escape the cold winter months.