right way

Please correct those sentences to right way(more nature way of saying) . Thanks!

1.I would like to tell you about my teaching experience in more detail since I am applying as this position.

2. We used to have a picnic in the park and it was one of my favorite things to do with them (who? If not specified, can leave out 'with them').

3. I got interested in Denmark while I study at university and I have been reading things like Denmark related books, articles and columns ever since.

4. When I am with kids, I am often become an energetic person ('changed as' is a bit awkward, can also say 'I often become energetic')