Sometimes these terms are used interchangeably, but when I examine the roles they play in my own life, I find there is an important distinction between the two. I see dreams as the big picture of what you want to do and where you want to be, and goals as the milestones along the way that keep you on course.
We need to have both. If you don't have dreams, how will you know where you're going and what direction to take? If you don't have goals along the way, how will you get there?
So go ahead and dream up the big pictures of where you want to go -- then set goals to aim for those dreams. As you conquer your goals, you will find yourself achieving your dreams. :)