I'm sorry for my late reply...my life has been a bit....let's say different, the last two weeks.
Yes, I am in Cta at the moment. You were right.
Sithonia sounds nice, its on my list too. The fact that is a bit more closer makes it approachable. I would enjoy visiting other parts of Greece too and even if its not Thassos, I am sure you would enjoy your time. You cant go wrong with Greece.
Two trips to the sea sounds really amazing!
I hope all your plans will be checked on the list.