My mother and sister are also couchsurfers and have always had great experiences as surfers and hosts. If I'm not around, they might be able to offer you a place. My mum's profile is: https://www.couchsurfing.com/people/leah-barnett-1

There is a cave in Tonga that you can only reach by swimming underwater. Once inside, every wave made cave fill with fog and clear out again. I also visited Egypt only days before it all hit the fan. Make of that what you will.