Air filter,
bleed your brakes,
flush your coolant, also read
this, and
this in regards to flushing your coolant.
Fuel filter, inspect your brakes, tires, hoses for wear and tear, and
tranny fluid
Use Royal Purple Synchromax, or GM Synchromesh for your tranny.
Don't touch the plugs, being that they're good for 100,000 miles.