Beaches Turks & Caicos, Hawks Cay in FL Keys, or Coconut Bay in St. Lucia

I am looking for opinions on these three places. I'm sure the Beaches in Turks and Caicos is great, but I'm honestly not sure we can afford it! Cocunut Bay looks similar, but half the price! And I've always wanted to go to the Keys.

We are looking to go in August. DC are 5 adn 8 years old

TIA!

Beaches Turks & Caicos, Hawks Cay in FL Keys, or Coconut Bay in St. Lucia

We went to Hawk's Cay last year. We really liked it and the kids still ask to go back. They were 3 and 6 at the time. We went with family and rented one of the town houses with the private pools. It was awesome! Our group had 5 adults and 6 kids so it was nice being able to stay together. The resort has something like 5 pools and a salt water lagoon. There isn't an ocean beach at the resort not sure if you mind. Fm me if you have any specific questions. I think my brother had found a deal on groupon or something.