I am going to think maybe a cab is best. If earlier, a bus to MK then monorail to Poly, but too late to go to MK. If not a cab, I would say a bus to DtD, then another from there to the Poly.
I am sure others will give some good input. You might also ask this on the Transportation board, as it would also fit topically there as well as here on the Theme park board (being both an attraction and transportation question).