I know this really does not answer your question, but Matthew (age 6) has been to OKW, BWV, and HH. We have visited Vero and VWL on a day trip, but did not stay there. Matthew has enjoyed all the location we have stayed at.
At BWV he liked the pool, but didn't want to go down the slide as he is not yet confident in his swimming abilities.
At OKW, he loved the pool. In addition, he loved looking for the wild life around the buildings, ie Squirrels, lizards, rabbits.....
At HH, he loved going to the beach. I was very surprised when he told us it was okay if one time we didn't go to Mickey's house and spent the whole week at HH.