Dear Wang:
Hi~! How have you been these days? I would like to express my gratitude to you for your kind treatment and good care during the summer. Specially, I appreciate it so much that your parents have had so much time with us for fun and all the delicous food prepared by your mother proved your mother's great cook skill! I will never forget the night we spent outside of your house, it was so much fun to have a party on the beach! You are welcome to ,if possible, come to my house the next holiday and I promise you will have a good time ! Looking forward to your reply.
Yours，
Zary