Bring a magnet with you and check for damage repair by sticking the magnet to the car in different places It wo't stick to the bumpers). If it doesn't stick to the metal, then bomdo has been used for repair.
Try to start the from a stop in second and third gear. If it pulls out okay, the clutch is probably pretty good.
Look at the T-tops for busted seals.
Try the fan switch in all four positions and make sure they all work.
Turn on the fog lights and make sure they both work (They will only come on with the headlights).
Check for water in the spare tire well.
I'm sure there's stuff I'm forgetting, but this should be a good start.