A few years back I took a Polaroid 123 converted to take 6 x 12 images on 120 roll film to Venice, other parts of northern Italy and Slovenia. I found plenty of opportunity to use it in Venice using the tops/ hand rails of bridges and quays for quick and easy camera support. Obviously I never stepped away from the camera for fear it would end up in a canal, but I'm happy I had it with me. The only caution I would suggest is in how you transport your film. Depending on your itinerary, and what stop overs you may have, you may end up in a country that insists on x-raying your film. I avoided the whole issue by using FedEx to ship my film home. The FedEx office in Venice in close to Piazza San Marco, very near Harry's bar. Or at least it was in 2008. Its a precaution well worth exploring.
Jeff