If you have a rental car then drive out of Poly and make a left onto Seven Seas Dr and when you get to the traffic light go straight through onto Timberland Dr, goes right into WL. They are really close. We just took our car when we went to dinner at WCC.
Otherwise you can take the monorail to MK and hop on a WL boat. Or take the monorail to CR and go to the boat dock and take a boat to WL form there. I would go the MK route though so you don't have to trek through the CR and down escalators.