Hypothetically..... What philosophies would govern a new planet?

For fun, we could pretend we are all still aboard our interplanetary space station. (The Exodus)
http://atlantisonline.smfforfree2.com/index.php/topic,2564.0.html

We hold an open think tank online station wide to vote for ideas about how we are going to care for the planet below.
How we are going to care for one another. What kinds of things could we do to ensure that our ideas will be implemented, and so on.

What types of things would you all suggest, and in what catagory would you place your ideas in?