I don't think 120k really means too much unless you haven't changed your oil since you bought the car... service periods/intervals are relative to when the last service was performed, not so much on absolute mileage.
If you haven't had it 'serviced' or 'tuned-up' recently, I'd go ahead and change the fuel filter, air filter, spark plugs, spark plug wires, spark distributor cap and rotor, check belts for tension/cracking/warping/missing teeth, oil change and oil filter change. If you feel like shifts aren't so smooth as they once were, maybe a transmission fluid change and differential fluid change. Radiator flush might be nice, too.
Lots of stuff to keep you busy, depending on how much time you have, when your last service was, and how much money you feel like spending.