I have done very little to this vehicle except for regular oil changes, new struts and tires, and breaks.  I want to get a tune up.  What should I expect they will say about my car. 
I have a 2004 Santa fe with 94,000 miles on it. ?
well if you haven't had a timing belt done yet i would strongly suggest replacing that. after that i would say spark plugs and wires, maybe a fuel induction service, and any flushes needed. 
I have a 2004 Santa fe with 94,000 miles on it. ?
At 94K, I hope that you have put in a new timing belt.  From what I have seen at my dealer, tune-ups run anywhere from $200-300, so prepare to cough up some dough.