I stayed (you can also use "spent") three weeks in Malta. 

In (you can also use "During") the first week, I was nervous, but I'm enjoying it now because I made a lot of new friends in the school.

Yesterday, I went to Comino Island with them. There is a very beautiful and famous beach there called "Blue Lagoon". It's really beautiful. I've never seen such clear and blue sea. We swam in there ocean, and it was great time.
Then, we went to our friend's flat and we talked about culture in our own countries.

My friends and I are always go out together. I like my friends very much.

(I hope this helps you!)