Dear ..., Thank you for everything what you did for me. Thank you for your patience, kindness and smiling every day. It was nice to meet you, I hope we'll see each other next summer. Keep in touch - my email: ...
Dear ..., Thank you for everything 'what' (to jest kalka z polskiego - tutaj THAT) you did for me. Thank you for your patience, kindness and 'smiling' SMILES (albo mozna ...smiling face) every day.