Great piece of writing! I have made some corrections, but what you wrote was very good, my corrections are more of an alternative and possibly a more natural way of saying what you wanted to say.

Today is a sunny day

This morning I woke up very early, and when I opened the window I could see that today would be a sunny day.
I love sunny days, because they always lift my spirits my spirit always is very good. I want to After I have breakfast, I'll take a shower and go out to conquer the world (not literally, of course).
Now, I have just came back and I am very satisfied with my day and all the things that I have done. Each day is important, and for that you always must always give the best of yourself.