Where there is your home? I think you have some National Parks surround you? Many people come from other parts of Thailand there?
As I told you by voice, these month it is difficult for me to leave Germany. Many Germans from other regions come to my and next to my town for holidays and for me as additional customers. If you still want I'll come to you in January for 4-6 weeks. But it is a long time till than and I hope we can see us earlier. You're hearty welcome my home every time you want. I know it is difficult to get a visa for Germany.
In 2011 my former girlfriend should come with me to Germany. In spite of all the papers I bought by the German administration here, insurance we made by a Munich company and also ticket for go back to Thailand she could show, the German embassy of Bangkok no gave her visa. Embassy say that it is not sure she go back Thailand before the visa finish. It is very good that your sister live in Germany such a long time, so I hope she can get a visa for you. When you stay in Germany you have to care for nothing, no food, no room, no fees, no tickets, nothing. You'll be my guest.
There are no snow in Germany in summer. See the temperatures here now and they will get higher the next months and snow you'll have with degrees Celsius minus 0.