look into boracay or phu qyu
Is there any flat water in boracay.. only heard that it is choop there?
take a look at the boracay videos on youtube to get a better idea. I would be surprised if you could get flat water in 20knots of wind. Boracay seems pretty flat to me.
We stayed at the 7 stones which were really nice accommodations. They are new condos and very nicely furnished with a kitchen. Right on the beach. Your family can watch you kite from the pool or from the balcony. The beach is narrow which has pluses and minuses - but again tons of video on youtube so you can get an idea.
We even ate at the little restaurant there a lot which was a bit expensive (for the philippines) but nice for a quick meal.