Last vacation

It is good that you enjoyed with your friends!! I am happy for you. :) 

My last vacation was 6 days ago, August 17.
>> My last vacation was 6 days ago.


I went to G[이름]gju with my friends.
>> Correct.


We stayed there 2 nights and 3 days.
>> We stayed there for 2 nights and 3 days.

We swam in the pool that pension survices for the guest.
>> We enjoyed swimming in their complimentary pool.


Only one of my friends took A tube so we took it at the same time and floated.
>> Only one from my friends brought a tube, so we took turns in using it.


And there was a water slide as well.
>> Correct.


It was quite extreme enough to enjoy.
>> It was extremely fun, so we really enjoyed it.

At night, we did barbecue. And I cook for my friends, but the smoke from the chacole was too strong to stand...and it cause keep caughing and tears hahaha. Anyway we had a great time.
>> We had a barbecue night. I cooked for my friends but the smoke was too strong for me to stand. I kept on coughing while cooking. We had a great time!