We've only shot in a graveyard once, and from what the director said the only proviso was that we picked shots so we didn't see any of the names on the graves: other than that I believe it was free and there were no restrictions. Just had to let the caretaker know when we arrived. Schools I'm not sure about, we did shoot in a playground at the weekend and had to pay for the caretaker to come in to lock and unlock the gate to let us in and out: I think it may have been where the director went to school, which would have helped, I'm sure. Shooting inside would probably be more difficult. Since we were doing it on the cheap we also had to live with the school football team playing a match on the football pitch and some singing group practicing in one of the school rooms: good for a playground atmos track, but it sure complicated sound recording for the shots. My experence with parks has been that it doesn't seem to be too hard to sweet-talk the council into letting you shoot there free as a low-budget, but pretty much every time we've shot in a park we've had officials come around checking we had permission. Other people have told me, though, that their councils wanted to charge extortionate fees to shoot in parks as it's apparently one of the few places where they can legitimately charge and they're used to the BBC and other people who can afford to pay good money. In any of those cases you'll probably need at least a million or two in liability insurance to satisfy them: however, you should obviously have that anyway just in case the worst happens despite being careful about safety. Also, it almost certainly helps if you live in the area or get someone on the crew who lives in the area to talk to them, the council are less likely to want to offend a local tax-payer than to worry about someone who lives miles away.