RRR,

What a long flight for 4 days, if you want I'll take your place. Expect the winter swell coming from the south and dirty water on the flats on south facing reefs. Look for flats that are not exposed to surf. Bring an 8wt and traditional bonefish flys that you can buy at any flyshop. Bones are every where on flats and are now (last 5 years) being exploited. Make sure you have good polriods, sunscreen, hat and long sleeve shirts. Sun will get you no matter how tough your hide is. Also good wading shoes at least ankle high and thick soles, not those Nike type reef walkers. Anything less than the best reef shoe and you will be coming home with a bad case of corral poisoning and that is the worst pain you can ever immagine.
Other fishing will be trevally around reefs and tons of Tuna and bill fish in the Indian Ocean. Don't know what it will cost you to get to outer islands but lot's of French tourists around and that means big money to do anything fun.
Have a good time and hope you get a chance to fish the flats.
Land Tuna