Great question — answering as the UphillTech team:
You're right, South Thailand is definitely more expensive than North Thailand. In my mind everything is just doubled in price. That's not to say you can't find a 35thb pad-thai or 150thb massage down South, it's just not as easy and common as it is in the North. I really only know about the South East islands: Ko Phangan Ko Tao Ko Samui So I'll just stick to them in my examples, but I'm certain that on the West side, Phuket is even more expensive, and Phi Phi similar. Ko Samui is generally more expensive than Ko Phangan, while Ko Phangan is more expensive than Ko Tao. It all varies based on when you'll be there though. If you're in Ko Phangan over New Years or a Full Moon Party, prices will...
Full answer by bryceadams: https://travel.stackexchange.com/a/8695 (CC BY-SA 3.0).
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