Dear [朋友的名字], I am writing to express my heartfelt gratitude for your warm hospitality during my recent visit to [城市名]. Your kindness and generosity truly made my stay unforgettable. I was deeply touched by your willingness to go out of your way to make sure that I was comfortable and had everything I needed. From the delicious meals you prepared to the wonderful sightseeing tours you took me on, I was constantly amazed by your thoughtfulness and generosity. It was a pleasure spending time with you and getting to know you better. Once again, thank you so much for your kindness and hospitality. I look forward to the opportunity to return the favor and host you when you visit me in [我的城市名]. With gratitude, [你的名字
