Honestly it would be a bit of a walk to get to Epcot or MGM and there are no sidewalks. At least none that I have seen. Also CBR is a large resort depending on what building you are in it could be a 10 minute walk to get to the food court. Take advantage of the buses you will be doing LOTS of walking at the parks!
CBR is too far away to walk to the parks and there isn't one solid path of sidewalk you can walk on. The bus system is very good all over Disney, but you probably already know that.
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