
I've kited at Cocos 3 years in a row. It's flat water sailing, witha bit of side chop as you head further north into the lagoon.
Suggest you take as wide a range of kites as you have.....anticipate anything from too much to to little wind. Also a low wind board (with some nice fins) is very useful so long lazy cruises across the lagoon. Beware of the sand.....even a little graze will always get infected; its very rough and actually hollow, and full of coral bugs. Likewise you are best off wearing booties.
If you need waves to be happy, go somewhere else. There are great breaks, but the good ones are off shore, and the ones you can get to are very dumpy.
I'm off to fiji myself.......more consistant wind, and lots of surf.