I am very fond of my Zeiss Nettars, but it's an aquired tase. I also have a Voigtlander Perkeo II like a previous poster, nice camera, fine Skopar lens on it. I have not impressed with the Agfa folders, they seem cheep compared with the others. You might go this route, with the shoe mounted rangefinder or get real good at guessing. At f11, don't make much difference. I would stick to 6x6 or 6x4.5 for film flatness issues.
Personally, I would take a Mamiya C220 TLR. But then, I don't let the girlfriend tell me what camera I can bring. How often do you go to a place like this?
Better than that, I would get a couple Cannon sureshots, a bunch of B&W 135 film. Fast, inconspicous, takes great pictures, won't annoy the wife, fit two of them in your pocket, one gets broken or stolen, oh well. Find them on the bay for less than 10 bucks.
tim in san jose