The ABC island latitudes get some of the best, consistent wind in the Caribbean in my experience. Of course weather norms may be drifting, also tropical weather can mess with the trade winds there big time. So, if you can go before late August, September, it may improve the reliability of the wind.
For Curacao, I had some outstanding kiting off Klein Curcao, about 7 miles offshore in the direction of Bonaire from Curacao. You do an offshore launch and may choose to ride there as well. I went around to the windward side but there are large waves and a ironshore there strewn with wrecks and debris. Lining up a chase boat makes sense although you may have trouble finding one. Otherwise most that I know of kite in St. Joris bay, a land locked lake. Unlike Bonaire and Pink Beach area much of the lee shore of northern Curacao is fairly high with lots of wind shadow. There is an interesting looking lagoon on south Curacao which might provide some Lac Bay-like conditions but getting to it without a boat may not be on. I would contact Eric for more info at http://curacaokiteboarding.com/
The less side of the island
The windward side with unfriendly landing spots, strong wind and waves to go with.
ps - I used to kite Lac Bay in 2000 and before the ban. It was nice and a natural for kiting at lower tides when the windsurfers were stuck in the channel just off of and parallel to the shore. I tried to help with some ideas to avoid problems in those days but they obviously didn't stick.