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Generally you can think of sympathetic stimulus causing contraction of smooth muscle with a few exceptions (bronchial dilation).

One activity would be the acute modulation of blood pressure through contraction of vascular smooth muscle cells in the resistance vessels.

While there is some debate, sympathetics probably set the steady state heart rate with very little acute control. Acute modulation of heart rate is caused by parasympathetic stimulus and mechanical factors (Frank-Starling relationship).

Sympathetics also aid in the mobilization of metabolic energy (lipolysis, glycogenolysis).

Look in any physiology textbook for autonomic nervous system and you can get all your answers.

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