Done Fiji .in July - August .had great wind ,everyday ,you have to take your gear ,6.0 7.0 .if 95 kg.
plantation island .
cook islands .june -july .but may is the windiest .can hire gear there at muri lagoon .a lot more to do there than Fiji .but a smaller area to sail.
some lakes in QLD are good .I'll let them tell ya .a few of my friends go every oct- nov.
WA..can hire gear .can hire van .has wind everyday .can do more spots .
oct- mar.
i go in late nov.its the best.

Already booked for november ...Great wind ,I like north of Perth .( Denham)
you need a weed fin .safety bay is also a must .a great bunch of windsurfer there ,very friendly .
hope this helped ..
i do like the islands and visited many times .just the lugging of gear from place to place .can be a pain .
WA is just easy ,hire the van ,and just leave you gear in the van ,for the two weeks ,or how ever long you go for .November is the quite time there ,and there is always plenty accomadation .vans can get booked out in December January .so book well in advance .
WA hassel free always wind .aviod feb.bloody heat waves .cyclones .
tardy .