[MMM]

How young are the children? I haven't been to Hiroshima, but I have hear the Peace Memorial Museum can be a quite moving and disturbing experience, so it might be worth checking out.

You should be able to find a bite at that hour, though it may be convenience store food (which isn't as bad as it sounds). Izakaya places are often open late.

I am not sure where your tour will take you in Kyoto... do you know?