I believe it's FOR SURE turning off lights and then- trying to conserve what ever else we can as well. We are shutting off our lights. The plan was to play a 'family card game' by candle light tonight. Now DD6 is not feeling well, so it may just be the 3 of us (DH, me and DD8) playing a game while one TV is on for DD6 to watch as she lays in bed.
DD8 and DD6 learned about earth hour in school on Friday, so they are all hyped up about it! DD8 came home with all these 'rules' and DH and I thought we'd try them just to humor our girls. Heck, it's only an hour! And it gives us a chance to do something fun as a family with out using electricity.