RE: El yaque for family
I have been there 12 times. Haven't seen many children (between 2 and 10 years).
In El Yaque there is not much to do for non-windsurfing family, except perhaps play in the sand / pool. There are no playgrounds, entertainment teams or something like that. El Yaque is very small. The sun is burning strong, so protect your children. Hotels are simple and small. Most hotels have (small) pools; there is no supervision.
Perhaps a better place to go to with your windsurfing buddies.