Keep your exclamation points under control. You are allowed no more than two or three per 100,000 words of prose. If you have the knack of playing with exclaimers the way Tom Wolfe does, you can throw them in by the handful.
Want some fiction-writing rules?
You can't go wrong with the rules in the above article.
My favorite rule: no exclamation points. If you must use one, have a d*mned good reason for it.