I'm keeping it because eventually I will return to the US with my wife for at least several years. If you cancel it then decide later you want Medicare back there is a penalty. I retired from the Army so I use my military health insurance called TRICARE which pays 75% of medical bills. I have thought about dropping Medicare but they made it mandatory to have if I want to keep my TRICARE insurance.
yes but still would be careful for a young teenage woman. I personally would discourage my daughter when she was at that age. You do know SE Asia is a Hotspot for human trafficking.
I hope you have someone in Thailand to travel with you when you arrive in country. Even though Thailand is relatively safe, I wouldn't suggest being by yourself. Just my opinion.