The Tyranny of Expectations

I try not to have huge expectations.  I know its next to impossible unless you devote yourself to a life of transcendental medication in some far off mountain with the sound of rivers and wind blowing through your mind but I try.  The hard part, is that they are there...insidiously puncturing your thoughts.  Maybe expectations are good and the failure to meet those expectations are part of the long march of suffering that we call life.  I am not exactly sure.  Letting go of expectations certainly brings an element of freedom but the fear is that freedom leads to a dull, not quite fulfilling life.  I am not exactly sure but its something I will continue to think on.  I am leaning towards some expectations are good and others are bad.  Choosing which ones to have is the answer...anyone have the answer?