Agree with Piros
any time you can get away and get over there
the way the weather is changing in the world its a hard call to say when its an ideal time
so go when you can and enjoy the Fijian culture
the beachouse can also organize to get over to heaps of surf breaks in there fast boats even cloud break if they have the numbers
its a relaxed place to stay with plenty of options and things to do
here's an old race flyer from a race I did back in 2012