So I'm going to be in Paris this summer and I want to take 2 days to see Disneyland Paris and Walt Disney Studios (enough time? it will be a Friday and Saturday). Anyways, I will be staying with a friend in Paris which means not paying for my hotel. I'd prefer to keep it that way and I was wondering if the train is fast and cheap enough to make this a viable option to take it there and back for 2 days. How late/early does it run? Any idea of the cost or specifics on the train/schedule? All I know is it takes about 30 minutes and is some RER train, but I don't know which. Alternatively, I could just take the train there on Friday morning, check into a hotel and drop my bags off, then stay there Friday night and return later on Saturday night so I'd only have to pay for one night of hotel. No idea if this will work either. Thoughts/comments appreciated.