Corrections in red.  Stylistics in blue.

P2 -"go on, on the go, here go again, go down with, have a go, go back on, make a go of & go ahead"

I met my friends at Marta's house.  There were also a lot of people there that I had never seen before. I found one of my acquaintances there.  "Hi Cristian, what's going on?"- "We're going to have a party" - "OMG, I have been on the go all day.  I don't want to start a party right now". He looked at me like and started to laugh. Ok, no problem.  Here we go again.

The next day I felt like I came down with the flu.  But I enjoy diving a lot, and I wanted to have a go in this lovely place.  Besides, I had promised to go, and I never go back on my word. I had a huge breakfast, very similar to a lunch, and started to feel very good. I went to the scuba diving center. It's a new center that a good friend started the last year, and he is trying to make a go of it. Some people thought the water would be slightly cold, but we went ahead and put on the equipment.

It was a pretty good weekend -- nice water temperature even in November, and a clear view of all the subaquatic species.