Astral Projection is like... leaving your body to explore a magical realm.
Lucid Dreaming is like... Going deeper into yourself to discover the magical realm within you.

In my opinion, they are both pretty much the same thing - it's all the way you look at it. In my case it's more interesting to go deeper within my own mind than to leave my body and go somewhere else.

I think you already know all the basics, so, enjoy your time here at DreamViews! I hope to see you around the forums, man.