My flight is arriving early in the morning to CDG and I need to be at Bercy in the early afternoon....I was thinking the easiest thing to do would be to take a shuttle bus in (found one that goes to Gare de Lyon) and then walk to Bercy. Is this a safe area to walk? I know the RER is cheaper, but I wanted minimal hassle due to the long flight. Thoughts? Am I missing a better option?