One thing you don't need to do is change a timing belt-- the 3.3 has a chain. You might want to have a mechanic evaluate how much slack it has developed to see if it needs to be changed, but I have never heard of one letting go on a 3.3. I have 230K on mine with no problem there. The timing chain is short and the drive gears are metal, not plastic coated, so it's durable.
As to other things, who knows? I can't think of anything that needs to be done maintenance wise just because of the # of miles. Just expect that at this age & mileage there are things that could go, such as a water pump or an alternator. I suggest just waiting until they go. My alternator just went a month ago. Keep on truckin' with regular oil changes and normal maintenance.