It's very easy to take the bus, from Pop, to DHS, and then either walk or boat over to YC. The boat ride will be about 20 mins or so, not including possible wait times for it to arrive. The walk is about 22 mins...get off the bus, walk towards the canal, with the parking lot on your right, park on your left. Go to the right of the canal...walk down beside the parking lot for a bit, then you will see a sign that directs you down a little slope, to BW. When you get to the end of this walkway (runs right alongside the canal), at the end of Boardwalk (it runs behind the resort), go left, up a little hill, and to the right and over the bridge. The Swan/Dolphin will be to the left, over the bridge, YC/BC will be to the right.
I enjoy the walk if it's not raining or oppressively humid.
BW is right across the lake from the YC/BC. It will take about 8-10 mins to get there from YC. Or, you can take the boat to Epcot..it's next stop will be BW, then it goes on to Epcot.