Does anyone know how clean the seawater in Haikou is? I have heard it isn't too great quality?

U are right that the seawater quality in all the famous beaches near the city is not that good as before, because many travels go there every day! Also you want a quiet beach. It may not that easy to achieve in the city.

If you don't mind, I would recommend the Gaolong Bay in Wenchang to you! There you can better enjoy yourself with cleaner water and quiter environment!

Just for your reference~

Thanks Coco, much appreciated!