If the AC system is blowing cold from all vents it is probably in pretty good shape. Some items to check/change include:

Fan belts
Coolant (change)
Transmission Service
Oil & filter change
Fuel filters (change)
Fuel screen in the tank
Valve adjustment
Air filter (change)
Air Filter Can mounts
Rubber brake hoses (check and change if found leaking or with cracks)
Date codes on tires (if older than 5 years best to change tires unless you plan on city, close to home driving only)
Replace all fuses with copper fuses
Check Rear axle boots for cracks/leaks
Check the driveshaft center support
Check the age of the battery