We crave new sensations but quickly become indifferent to them. In the literature on sensation this is called sensory adaptation. We are less sensitive to a stimulus after constant exposure to it. It is why people who live next to the freeway are not bothered by freeway noise.
But there is a moral to this story. This need for novel stimuli cannot be overcome. We are restless like the waters of the sea.
It is the bane of any philosophy that says to be satisfied with what you have or where you are.
Philosophy: A Way of Life 