Hi Andreas,
PE8 should cover practically all heavy situations easily - poppers and stickbaits from 80-150 work though 100-125g seems to be the main sizes used.
PE3/4 for lighter inshore lagoon stuff also, smaller 110/130mm halco roosta's and other casting lures. You're going in YFT season and this area sees a run of school tuna 15-20 up to 60kg fish. (on poppers)
The terrain isn't too nasty and gear losses aren't too bad. As Doug & Sachin said the Ono & Kadavu waters hold respectable fish, if you measure the experience in kg's. The crew are fine handling the boat once your hooked up to maximise your chance of landing your fish.
Just on a side note. Doug's trip was one of the earliest ones to visit Ono, back in Jan 2010. From memory they caught a stack of GT's, missed some 50kg+ GT's and hooked cow yellowfin also. Since then the crew has a heap more experience, a new sounder, T-top (soft cover) & bow rails added on the casting platform to make it more comfortable for anglers.
Seafood does make up a big part of the diet, as does home grown fruits and veg. Massages are available post fishing. No other guests share the anglers lodge. The staff are great, sometimes putting on a kava ceremony and lovo banquet for the guests last night all off their own efforts.
It's not Nomad. Doug may have found this 'rustic', but for many this type of experience is paradise.
Cheers David
ps - you're coming from WA aren't you? Get Western Angler current issue, read Brad Bells article for an impartial report.
pps, Mods hope that's cool, please respond if you need to.