In Spain they have a saying: "Your life is complete when you have had a child, written a book and planted a tree".
Someone commented recently, that what is more difficult is to raise a child, water the tree every day and get someone to read your book. As far as raising a child, it's a job you will never complete in your lifetime.
For a book which invites the reader to examine what is important in life, check out my book, Happy Juice:
Happy Juice on Amazon
For a fun kids' book about the importance of planting trees, based on the Spanish legend that once there were so many trees that a squirrel could cross the country without touching the ground, simply going from tree to tree, try The Last Tree. It might encourage your kids to plant a tree and be able to tick off one of those goals in life!
I have now converted it into a video, so follow the link to it on Youtube:
The Last Tree on Youtube