@Phil thank you very much!

I will more keeping try hard

it should very tired after a long  bike trip 

it should very after a long  bike trip 

Good job, I actually liked the Chinese turns of phrase — your version seems really poetic. Here are some corrections, because I know you’re interested in sounding like a native English speaker:

Yesterday my friends and I rode bikes in the city near the reservoir. In the summer, we ride bikes on the forest trail.
(While we ride,) We sing out loud hehe:)
I hadn’t been that happy in so long! (or "I was happier than I'd been in a long time" -- there are many options to say this.)
I had a nice day!!

You should use the “notebook entry” feature instead of the “discussions” feature if you’d like corrections.

Please correct my mistakes in grammar part 

Thanks