На завтра написал на англ. нормально ???(Без ошибок ?).

How are the things going on? Has anything (в вопросительном предложении somtning не употребляется, и время бы надо перфектное) new happened in your life? I wanted to reply immediately (to your letter)? but I've been working a lot during/for the last two weeks.

Now I want to tell you about my next-? winter vacation.

I wanted to spend it in the mountains. Skiing is A very popular sport in my country. It is very interesting. I began to ski in my childhood with my father and sister. We often went to ski -? in the forest. I think (the) fresh air, nature and sport (или, проще говоря, outdoors) is very good for me. That(which) IS why my favourite hobby (pastime) is skiing.
The mountain-skiing camp (I stayed at) is situated in the Karpaty. This camp is very popular and a lot of people visit it every year. There are 4 skiing tracks. Three of them are for skiing and one for snowbording. Also there is A ski lift, a cafe and a lounge where you can take a rest. The track is about 3 kilometres, so the speed you can develop there is very high. Then after the skiiing camp I wanted to visit my grandfather who liveS in the city of Karaganda in Kazakhstan. It is A beautiful city. I miss IT (or him - granddad?).
So that is all about my holiday. Write me more often.

Обратите внимание на артикли. При перечислении с неопределенным артиклем его надо повторять перед каждым членом перечисления. Если в начале стоит определенный, то его одного может быть достаточно на всех.

Больше всего ошибок из-за неправильного порядка слов: где и когда обычно стоят в конце предложения, но не в середине, не разбивают подлежащее и сказуемое. Подлежащее и сказуемое должны быть всегда и именно в таком порядке: подлежащее - сказуемое.
I was going to answer your letter immediately, but I have been working a lot for two weeks.
Now I'll tell you about my future winter vacation.
I'm going to spend it in the mountains. Skiing is very popular in my country. It is very interesting. I began to ski with my father and sister in my childhood. We usually went to the wood and spent our time there. I think fresh air, clear nature and sport are very healthy. That's why skiing is my favourite free time activity.
The mountain skiing camp is situated in Karpaty. This camp is very popular with the young people and a lot of them visit it each year. There are 4 skiing routes. Three of them are set for skiing and one route is for snouborders. There is also an elevator, cafe and the building, where you can take a rest. The route length is nearly 3 kilometres. The speed that you can develop there is very high. Then I'm going to visit my grandfather who lives in Karaganda which is the country of Kazakhstan. This is a wonderful and beautiful city. I miss my grandfather (/it) very much.
So that is all about my holiday. Write me more often.
Goog luck.

VlaD.

Skying