Jonas,
With a bit of luck I'll be back down there in a few weeks time so keep the fishing on the boil for me!
There is basic but comfortable facilities on the island; beds are comfortable, showers are hot, food is great, people are friendly and you can even get the odd bit of washing done for you so you don't need to bring a full set of clean clothes to cover every day (more room for lures!!). Get used to very early starts even though the fishing grounds are close..we put the first lures in the water when it was still basically dark! Because the fishing is relatively close most of the time you come back to digs for lunch, a shower and even a half hour nap. The boats are state of the art and are fantastic fishing platforms. Cameron Mundy is the guide down there at the moment and he and the local captain are exceptionally knowledgeable as well as being great guys.
My biggest piece of advice is to pace yourself. It's a marathon not a sprint (great advice from Nick by the way). A steady, intelligent approach will result in you being able to fish all day for the 5 days and not be a mumbling wreck by day 3! You can always hold back and wait for all the guys you're fishing with to bring the pack up with the Hammerhead G cups and Gamma 250s and then put a cast in behind them, I did (ask Nick or Alex or Wayne)!!
All joking aside though, I'm a comparative novice, 55 years old and NOT fit. I fished a Cubera 180 a lot of the time (admittedly from the bucket) and fished pretty solidly for the whole 5 days with this advice and the odd Voltaren....and absolutely loved it!
Oh, and be prepared to sleep the sleep of the dead at night.
Hope this helps.
Regards,
Trevor