Red: My corrections

Blue: My comments

Summer is coming

Today,I get up very early and have a run in the park.

Today, I wake up really early so I can go running in the park.

The flowers in the park are now in full bloom.

Did not find anything wrong with this sentence. 

when I watch the flowers, my mood also become as beautiful as flowers.

When I look at the flowers, my mood becomes just as beautiful as the flowers. 

I like the summer and I like the warm of the weather.

I like the warmth of the summer's weather. 

I like the blue sky, the green river, the colourful flowers.

I also like the blue sky, the crystal clear river, and the colourful flowers.

Changed the sentence a little to make it sound better. 

Get up early really give me the best mood. Do you like getting up early?

Waking up early really gives me the best mood. Do you like waking up early?

Not bad. Waking up early does give me a lot of energy, when I have plenty of sleep!