I guess it depends on when you are going.
I'm not familiar with AS's, but we just returned from a stay at WL.
Yes, you can take the boat from MK to WL. It's a nice trip. WL also has direct busses from TTC. If you can get to either FW, or CR, there is another boat that does a "triangle" all day between WL, CR & FW. Also, direct buses from all the parks, water parks & DTD. Maybe it would be quicker to take a bus to AK, then the bus from AK to WL.
I'm sure Tyler (Chip & Dale) can give you a better answer!