Traveling there is easy, getting back is the pain! You will need to check the hours of the Magic Kingdom, this will come in handy on your way back. Also, we were told many wrong things by castmembers and then has to backtrack and it took almost 2 hours to get back.
The way we like to go is to take the bus to Magic Kingdom and take the boat to Ft Wilderness. It is a short walk from the dock!
On the way back, if the MK is still open, then do the above in reverse. If it is closing or just closed, take the bus (may have to take an internal FW bus to the other FW bus) to Downtown Disney and transfer buses to Beach Club. If MGM is open late, you can take the bus there and then the boat or walk to Beach Club.
We were told that the boats from FW would go to Contemp and Poly after Mk closing and we could take a monorail up to one hour after MK closed to MK and get a bus. Wrong, the monorail doesn't stop at MK after it closes because nobody will be needing to go there. Then we were told at the Cont. to take the monorail to Epcot and the bus to Beach Club, WRong, there are no buses to Beach Club, you would have to have a ticket into epcot, walk all the way thru to the international gateway and then out to the Beach Club.
Hope this helps!