Most rides just had to throw your bag onto the platform or the station and some required you to take it onto the ride with you (the only ride I did where this was the case was the waltzer). I'd think that go pros are ok, the ops didn't seem to take much notice of health and safety (walking across the track while the train was coming into the station and walking round the ride area while trains we're moving).
Had a brilliant day on Sunday. olympia was completely worth getting up at 5am and spending 9 hours on a coach. Other coasters didn't come close to my top ten, but I really enjoyed the flats like air, the gravitron and the waltzers, all of which were run on insane settings that actually brought me to tears. I just wish someone had told me that hangover drops twice as I had no idea until i was on it.