Думаю, нужно написать не эссе, а письмо.

                                                                                              наз. твоего города,

                                                                                               Russia

                                                                                     число(например:17/03/12)

Dear имя друга,

   Thank you for your letter. It was nice to hear from you. I'm sorry I haven't answered earlier, I was busy.

   What a pity that you didn't come to my birthday! It was the best birthday party I have ever dreamt! All my classmates were here. As you know, my parents organized party in the little cafe, so it was comfy and funny. We ate ice-cream, different sweets and other tasty dishes. Also we danced much, sang karaoke.

   It's spring now, and summer will be soon. What are your plans for the summer? Are you going to visit any new places? What do you think about visiting my town? Are you going to spend your summer holidays with your parent?

   oh, I have to go now, it's time for my favourite TV show.

    Hope to hear from you soon.

    With love,

         твое имя.