Exchange students at the end of their study abroad periods can give this goodbye letter to great host families.
I can hardly believe that {amount of time} has gone by this quickly and that it's already time for me to say my goodbyes and return home. Your family has been so amazing for the duration of this exchange trip; I truly felt welcomed as part of the family.
Thank you so much for helping me to immerse myself in your country, culture and language during my stay. My favorite thing was {memorable activity}, although seeing the {cultural landmark} was breathtaking as well. I really feel like your encouragement and patience has also helped me develop in my {native language} skills.
It has been such a blessing staying with you and getting to spend time with your family. You have made this such an education and memorable trip, and I will always think fondly on the time we were able to spend together.
Thank you.
