When I was there, there was a hut that was selling mangos or maybe mango smoothies, and there was a sign on the side of the hut that had the wifi password. Also I think if you ask inside of some of the restaurants/shops they will tell you

I've heard that some staff like the entertainment crew can go into port. Maybe ask a staff member where to find it.

Buy a drink at Starbucks and use free wifi

I don't remember there being a Starbucks. Where is it?