Если письмо другу, то такой вариант:
Hi Ben! Thanks for your email. How are you? I hope you are OK. I miss you very much.
Well, I want to tell you about my summer vacations. It was a fantastic time! I visited aquapark with my family. Moreover, I visited cinema with my friends every weekends. We watched a lot of interesting movies. I relaxed from school. I can do everything, what I want in summer. Well, if I want, I will do nothing:)
What about you? How did you spend your summer holidays?
I'm looking forward to your letter. Keep in touch.
Love,
(своё имя)