Not directly. You could hop on the first theme park bus that comes along, then transfer to a bus going to the Boardwalk. To come back you would do the same in reverse. If you get a bus to Epcot or the Studios you can actually walk to the Boardwalk. If you are returning back to your resort later at night after the parks are closed you would need to take the bus to Downtown Disney, then catch the bus to your resort. Taxis are also available, of course they charge you.