Take a peek at the O2 sensors, if they're real black and coated, replace to improve gas mileage and idle. The computer allows the engine to run better when O2's are in good shape.
As stated above, change/flush/fill all fluids. I'd flush/fill coolant and while you're at it, replace all cooling hoses and main belt.
Check for leaking around differential. Mine leaked around 100,000 so I bought ramps, new gasket, diff fluid, and friction modifier. Basic tools needed, nothing special. Took about an hour to complete. Very easy. My old fluid looked very different from the new stuff that went in, so I guess it was a good service to perform.
I'd also look at subframe connectors ASAP, if they're not already there. I don't know much about verts, but if you don't have subs, get them. Reduces (may stop) squeaks and will improve handling. Cheap mod that saves the frame or at least deters further wear.
An odd item, but check out your mufflers. My stock mufflers were blackening pretty bad at around 90,000 miles. I'm sure others may have lasted longer, but just a simple muffler change improved the sound (flows). Needed to replace them anyways and just replacing the mufflers (not a full catback) was the cheapest method.
Good luck!!!
Can't believe I forgot to tell you to check the balancer. That's a biggie! Good advice Killercanary.
I guess I'll just have to keep an eye on it.
