I love writing for YA, probably because I am a kid at heart, and like most adults, long for the energy that I have lost and the outlook on life. When you get to my age some of the magic disappears in life. I love trying to recreate it, to remember.
Here's some good advice from the book "Writing and Selling the YA Novel" by K.L. Going.
"The important thing to remember when creating your plot is to make sure there is something that ties everything together from beginning to end."
When I read this I went right to my novel and checked to see if I had incorporated this principle. It wasn't as clear as I thought it should be and so worked it in.