Others speak far more eloquently than I this day, so I simply say to you:
If you see someone in uniform, or know they serve, thank them.
If you see someone you know has served, thank them.
Remember those who paid the ultimate price so that you are free to celebrate this day as you see fit; that paid that price such tyranny has been halted many times large and small; and, that gave unto each of us that greater love such that one laid down their life for another. Take a moment, if possible make it a special moment with family and friends, and simply remember them.
Remember them with thanks, with love, with joy, and celebration, for they would want it that way.