I just changed the oil filter housing gasket, it involves taking the alternator out to get access to it so once the belt is off you can check the state of the pullys and idlers, replace any that feel or sound rough. Since you are in there it would make sense to replace the water pump and thermostat if you don't know their history. Inspect the belt for signs of wear/cracking, replace if you find any.
I also changed the CCV system pipework, used a kit off ebay, I did have to remove the inlet manifold to fit the bits that are under the manifold it was just too much of a fiddle to get to those parts with the manifold in place.