Has anyone been on one of these, and at what stage of your pregnancy did you do it? I asked about these at my booking in, and was told that they didn't offer them as a matter of course, and no-one has said anything about them to me since, but am now 26 weeks, and beginning to think about the birth. I think would really like to familarise myself with where it will all be happening. I've seen tours advertised on the hospital website but it doesn't say anything about when in your pregnancy is a good time to do it. I don't know if its best to hang on 'til right near the end so its all fresh in my mind...any experiences?