Hi. I came to Thailand on 30 November and get 30 days and I go and get a extension for 30 days more,but I still want to stay 30 days more. So I have to travel out of Thailand to get 30 days more, do I have to fly out and in again to get 30 days more or can i use a land border? I stay in Chiang Mai so what is easist and cost less to do? Thanks for helping me.