All the options mentioned above are correct. You can take a boat or monorail to MK and then a boat to WL from there. You can take the monorail to Cont and then a boat to WL from there. You can walk over to the TTC (right next to the Poly) or take a monorail to the TTC (walking is faster) and then take a bus to WL from there. The TTC bus route is by far the fastest.
The fastest, easiest route is by car. We stayed at WL in September but visited Poly several times. The two resorts are basically across the street from each other.
P.S. We rented a car and found driving much faster and more direct than the buses. It gave us more time and much more freedom.
While these resorts are "basically accross the street" from each other, do not mistake this to be a walking distance. You should not attempt to walk from Poly to WL.
I loved the boat ride to MK, then switch boats to WL.
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