Rolleiflex 2.8E, with a second as a backup. K.I.S.S. As an alternative, my Contax G1 & G2 plus 21, 28,45 and 90 lenses. Not so simple, but it gives me a wide range of focal length options. It all depends on if I've been there before or not. If it's my first time, I'd more likely take the Contax kit. For a re-visit, the Rolleis for sure. If I'm in glutton-for-punishment mode, the Canham 5x7 with the 4 3/8" W.A. Dagor, 240 Heliar, and 12" Commercial Ektar (or maybe the 450mm Nikkor-M).