I generally just bring my bike in in the times I have toured to cities or through cities or just when commuting. Most places are pretty cool especially if you tell them what you are doing or you just kind of do it. I will a lot of times tell them I have no lock (which tends to be true in many of those situations) and they are OK. If nothing else I would probably take my panniers and such inside and lock the bike up with a u-lock or something in certain places or with a cable in others. I might also take a wheel with me that way they cannot ride off at the very least.