Q&A

 Master

Timing belts are regularly scheduled maintenance--they should be changed at a mileage interval specified by the manufacturer and clearly communicated in your owner's manual. You can check RepairPal's estimator for guidance, too: http://repairpal.com/estimator

It almost always makes sense to do the water pump and timing belt together, because the water pump is 150 or so dollars, but it requires all of the same labor as the timing belt. Really cheap insurance against having to do a big expensive job more than once.

 Master

matte is right!
Yes, the 3.0L V6 engine on your vehicle is driven by a Timing Belt.