If the timing belt has not been changed, it is a bit past due already (90K miles) assuming you have the 6 cylinder engine. If the timing belt fails the engine will be severely damaged. The coolant should already have been changed once; if not, do it now. The water pump (in the 6 cylinder) is normally replaced with the timing belt. The transmission fluid can be changed as a matter of good form. That's about all.
See page 15 of the first source.
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