Hyphens and Adjectives

We need to remember that when two words work together to describe another, those words must be connected with a hyphen:

"Two hours of high energy family fun just one hour North of the Dallas Metroplex."

Now, the above sentence is a fragment that works because of the context. However, there needs to be a hyphen between high energy to make the sentence correct: Two hours of high-energy family fun just one hour North of the Dallas Metroplex. And there isn't a hyphen between energy and family because family fun works as one noun, even though family describes what sort of fun.