My ancient ('99) Town Car has a "valet key". Other vehicles have similar functions by way of a switch in the glovebox or some such. (I'm not sure if the '98 Caddy has one.)
Essentially, the key will only open the car doors and start the car. If I remember, the trunk and glovebox, if locked, will not yield to the key. THAT is the key you give the kamikaze valets....
(I love to tell people that I have something like $90,000 worth of cars in the driveway. Unfortunately, the newest one is 17 years old.)
I never let anybody drive the car (except, grudgingly, my wife
) for a very long time, but somewhere along the line I changed. Probably the lovely young girl working as the valet at a restaurant in Boca Raton one evening. I told her that I had to park the car, but would give her the $1 anyway. My wife wasn't along, but my parents were.
(Not that I would have, but one can dream
(The wife and mud monster flew to PBI to meet me - I was on a business trip to SC, and then headed to Boca to meet them. Meantime, my parents were snowbirding there. I put Sherri and Becka on a plane in the AM, and then hung around for a day to reset. My folks and I went to dinner. Next AM, I headed north.)