Diamond Water Sport is the big name on Boracay, they do all the tours and water sports and are well organized they have the lion's share of boats, jet skis, and parasails on the island.
I found out the hard way that many online adventure tour vendors and locals re-book them and charge you double or triple the price of what you will pay on Boracay.
You can go to their website directory or better yet walk down to Station 1 on White beach and get discounted prices on anything you want to do on Boracay. read more