I like silly movies, and one of my favorites is the ultra-silly and wild Stanley Kramer flick "It's a Mad Mad Mad Mad World." You may remember the show. Smiler Grogan, played by Jimmy Durante, crashes his car down a hill and is tossed from his car. Before he dies, Smiler tells 5 men, played by Sid Caesar, Buddy Hackett, Jonathan Winters, Milton Berle, and Mickey Rooney, that he's hidden "350 G's" under a "big dubbya" in Santa Rosita State park. A wild chase ensues for the next 2.5 hours as the 5 men and several others make a dash for the cash.
If you've ever wondered about the film locations then and now, Mark Furqueron has a nice site showing you all you've ever wanted to know about the road locations of the film. Here's a San Diego Union Tribune story on the Seven Level Hill area where the opening scenes took place. Here's information on the airport scene.
Here's Seven Level Hill at night.