Sawa-I-Lau trek info

I want to go to Fiji. I was on Tahiti and Tonga, and now I want to see and visit hundreds of islands and islets of Fiji. I know nothing about it and I would like somebody to tell me something about their location. My friend told me about Sawa-I-Lau and said that there are some very interesting caves on that island. How should I come there?

The Fiji islands are situated in the Pacific Ocean, its southern part. Sawa-i-Lau is a part of Yasawa Island. Don't take my words for granted. This is a place I've never been to. Some people I know were there and I actually retell their stories. They told me that Sawa-i-Lau is the most exciting experience they had because they entered some of the caves this place is famous for. Caves are pretty inaccessible and you can't approach them on your own. You must be led by an experienced guide. There are several chambers in each of them and it really looks like playing a computer game and going from one level to another. Some famous Hollywood movies were filmed there, as far as I know.