This isn't a proper touring question, but: my family and I are planning to go back to Holland next summer. We'll mostly be in one place (and can store the bikes inside the house), and will be biking as much in the cities as on long hauls. My first instinct is that we should just bring our road bikes, and some big Kryptonite locks, and hope for the best. Or we could bring our hybrids; and big locks, and we would be less sad if the hybrids got stolen. OR we could guy folding bikes, which have the advantage of being free and cheap on the trains.
Does anyone have any thoughts on this? When we were in Holland this past summer I was struck by how nondescript almost all the bikes were, so that som really nice bikes (road, hybrid or folding) might just be asking to get stolen, and certainly everyone seems very aware of bicycle theft. Last summer we rented bikes, but those bikes were really uncomfortable and it wasn't easy to find ones small enough for the children.