It's already sort of been covered but I thought of a few more things:Could you elaborate which hose and belts?
You've already listed the serpentine belt.
Hoses- heater, radiator and new clamps. These get old, dry, brittle, thin, weak.... and a failure 20 miles from paved roads or a parts shop is a problem. While you are at it, if the coolant hasn't been flushed and replaced 120k is a good time to do it.
Brake lines. 120k is a lot of stops for those brake lines, and that is a service item which I think is often overlooked.
PCV valve, someone else mentioned. Its cheap and easy...
O2 and Mass Airflow sensors aren't too expensive. Rumor has it their accuracy deteriorates over time and they should be changed at about 120k. So, even if they don't throw a code you might want to change them to keep your rig running right.
Spark plugs at 120k if they haven't already been changed isn't a bad idea.
Heater hose tees. Those are a known issue on the 100s. I haven't heard about a problem on the 200s, but there has been some chatter about preventative upgrade/replacement. If they aren't too expensive and if you are changing those hoses anyhow, either put in new OEM or maybe get NAPA to pull a matching set in brass or aluminum from the good old parts books.