There are some commandments that teach us to break our desires and keep away from gratifying them. But on Shabbos, the mitzvah is to enjoy ourselves with pleasurable things, for the goal of Shabbos is not to break nature, but to sanctify it.

The goal is to elevate our physical lives and add a dimension of sanctity to our being.  Since the lesson of Shabbos is that Hashem created all that exists, we therefore are required to sanctify nature and connect it with His service. 

~ The Beis HaLevi