Rewrite these sentences in a more informal style. 1. I think

Rewrite these sentences in a more informal style.
1. I think my best friend is fun.
2. Thank you for the book. It's very good.
3. I got lots of very good presents for my birthday.
4. I think there are lots of very good places to visit near here.
5. Thank you for inviting me to your party. It was fun!