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check the tire pressure,
new oil
check for signs of brake fluid leaking (or any fluid for that matter, but brakes are the most common)
check all fluid levels
(if you really want, but not necessary you can prime the oil pump, but a BIG PITA if you dont already need to remove the dist)
Check the belts and rubber
oh and grease the ball joints (ever grease fitting you can find)
and in some cases, chase the critters out of the exhaust!!!
At 6 months, I'd charge the battery and crank it up. Oil should be fine. Unless the engine is new, say under 10,000 miles, I wouldn't worry about anything special.