たとえば、Johnsonさん宅でホームステイしたとしますと、
Dear Mr. & Mrs. Johnson,
How are you doing?
I had a great time in Canada.
Before the homestay, I was worried but every one of your family was very kind to me and I really enjoyed the stay.
I liked the meals dad made every day.
Mom spoke Japanese in the end!
I needed to study English much harder before I go to Canada again.
I had a lot of good memories with Mariko.
I still remember the first day. We played UNO. There are lots of other memories, too.
I was really lucky to be able to know your family.
I have a summer vacation now and I swim every day, remembering the pool in Canada.
I'm sure some day I will visit Canada again.
I'm sending some pictures. Please take a look.
Sincerely yours,
XXXXX
以上でいかがでしょうか?