Придумайте пожалуйста сами. Только что бы не сильно навороченно было. Не слишком много
Dear...,
My summer holidays were very interesting. I spent them... I visited... Most of all I enjoyed...

Dear Liza,
My summer holidays were very interesting. I spend them at my granny’s. There are many things there to do. What I did most of the time - I swam in the sea and sunbathed. It was wonderful. We told anecdotes to each other, and did everything we wanted. I also got used to walk alone in the forest. Most off all I enjoyed the cook of my granny. It is fantastic.