Hide selection = ctrl + H
Show last hidden = shift + H
I think anyway! But to be honest theres an easier way to hide stuff by type, as I'm guessing you wont want to see your cameras again for a bit. In your panels (ie. side / front / persp etc) look in the 'Show' menu - that'll make hiding and showing stuff nice and quick. Hide selection is probably better used for hiding stuff like geometry that's getting in the way or you dont need for a while.
Unfortunately I had a bit of a disaster when I converted the thing to SubDs... I didn't realise my vertices weren't snapping together when I merged them.... now I have to start over because there's too much to go back over :'(
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