The above post offers some really good, practical advice on how to think about this paper. To give you some more ideas you might consider writing about how your hobbies differed from country to country (if they do). You might also think about what would be most interesting for an audience of your peers.
What would your friends want to know about how these two countries differ, how they're the same?
Once you have your topics picked out, you can write your body paragraphs narrating your experience with specific examples. When you've finished your body paragraphs, you can go back and write an introduction.