A Buddha is so fulfilled, but there is no excitement about it. He's simply fulfilled. He has not achieved anything, nothing new has happened, but he has simply become so content with himself that it is very, very cool state of enjoyment - it is a cool state of bliss.
Remember, that is the difference between bliss and happiness: happiness is excitement; bliss is happiness without excitement. If there is excitement, sooner or later you will get bored, because only when the excitement is new it is excitement.