Been to a few of these but I’m thrilled at number 18 - Dominical, Costa Rica!!!
http://www.cnngo.com/explorations/life/worlds-50-best-beaches-364981?page=0%25
Good list, really good. I’ve made it to 5 of them and a few near misses.
Maya bay in Thailand is stunning. Just need to go in the off season otherwise its like Disneyland.