Informal letter...please help me !

topic: Write an informal letter to your pen friend teling him/her what you have experienced during this week being a host to a stundent from a foreign country.state what you liked or didn't ike,explain if the program of the week was fun and if you enjoyed the exchange. (approx. 300 words)

My beginning :
Hi Natalie!
Thanks for your letter,it was so nice to receive the last news from you . I'm sorry I haven't written back for so long.You know,exams and learning ...
How are you? I'm fine and hope you'll be,too.
You asked me in your last letter what i have experienced during the last week when a student from Australia was here. So here it is :
Here name was Lucy.

Yeah... maybe there is someone who can continue my letter because i have no more ideas to make a good letter. my tries were bad and boring . i always wrote the same... (after that,then.)

some ideas: -week list : -shopping at limbeker platz (berlin,germany)
-musical wicked (oberhausen,germany)
-go to sunny park lanes
-riding
- dinner at reataurant
enjoy the exchage program ? YES ! was funny