What should I do, Oppo?

A few miles from my house, there's a guy with a backyard full of classic cars. There's a couple 356s, an XK120, some old Alfas, a Tatra, and a whole bunch of other stuff. Some of you might remember that I made a post about this a while back. Anyway, I want to go see these cars. Badly. The problem is, the house is down a private road, and the only way to see the cars is from a bike trail a ways a way, or from google earth. How do I convince this guy to let me see these cars? Send him a letter, knock on his door, or something else? I'm stuck.