Dear Jane,
I am writing to extend my sincere gratitude for you and your family's warm welcome last month. During I was in America, you took me to many places that I was greatly impressed. I had never experienced such amazing things before. Besides, I am really grateful for you mother's delicious dishes. I liked them very much so that I often think about them now. It's you and your family who brought me wonderful days in America. Please accept my gratitude, now and always. And I sincerely hope that I have a chance to welcome you and your family in China.
Sincerely yours
Claire