Помогите, пожалуйста! Нужно написать письмо другу. Тема: "Неформальное письмо". You have received a letter from your English-speaking pen friend Peter. ...Hope you had a great summer. What did you do? Did you have a goog time? It is my birtgday next week and I can not wait!.. Write him a letter and answer his questions, then ask him about his birthday plans.

Dear Peter,
Thanks for your letter.
Sorry, I havent written for a long time, cuz i was busy.
 My summer hollidays was great, I gone  to the seaside with my family.Im playing with my friends all my summer hollidays.If you want, I can came to your birthday at next week, I think it will be very exciting and unforgetable.
Where would you want to go on your birthday?
Do you invite me ? 
What do you want to get as your birthday gift?
Sorry, I need to help my mom.
Best wishes,
Аяо.
Довольно не большое письмо, но все же основную часть изложил, можешь дополнить.