Informal e-mail.

Hi mates, I need to write a informal e-mail to a friend telling him about my weekend for an English exam next month. I must to state my reasons for not being able to go to work on Monday and to use the appropriate style for the situation. Please check my writting, it will be very useful for me.

To: John Shepard.
Subject: Outside weekend.

Hi John, you won't believe what I did last weekend.
Last Friday, Molly and the kids wanted to go to a cabin in the mountains. You know that I don't really like camping , so the idea about the cabin sounded good/great.
The house/cabin was fantastic! It was so peaceful, clean and the sofa was really comfortable ( later you'll know why I say that, haha !! )

On Saturday morning we went for a walk along the river. It was amazing! However, when we were coming back/ returning to the cabin, I was talking to my pet and/when I stumbled... The doctor  said/ told me that I had twisted my ankle, so I spent all weekend on the sofa - at least it was comfortable.

I need to ask you a favour. Please tell the boss that I'm not going/ will not be going to the office on monday, and possibly tuesday, as well/also. I'll send  him the  sick leave certificate.

Thank you so much, and I hope to recover in time for the match  next week. See you buddy!

*I'm not sure if I must to say "you're knowing/you are going to know.
**I'm not sure if that is correct in written expression.
*********I've tried to express the e-mail is sent on Sunday, I think the tenses are correct.

Thanks in advance.

This is my suggession:

To: John Shepard.
Subject: Outside weekend.

Hi John, you cannot believe what I've done this weekend.
Last Friday, Molly and the kids wanted to go to a cabin in the mountain and staying in a cabin. You know that I don't like so much camping outside, so the idea about staying in the cabin sounded good.
The house was great! It was clean, peaceful and the sofa was comfortable- later you'll know* why I say it hahaha**

On Saturday morning we went for a walk along the river. It was amazing! However, when we were coming back I was while talking with Pet and I suddenly stepped wrong... The doctor has said that I've twisted my ankle, so I've to stayed on the sofa all the weekend - at least it's comfortable.

I need to ask you for a favor. Could you please say to the inform boss that I'm not be able going to go to the office on Monday, and maybe either on Tuesday. Later, I'll take give him the document of my sick leave letter.

Thank you so much, and I hope be fine for the match of next week. See you buddy!

*I'm not sure if I must to say "you're knowing/you are going to know.
**I'm not sure if that is correct in written expression.
*********I've tried to express the e-mail is sent on Sunday, I think the tenses are correct.

Thanks in advance.