Pop to Poly: Take the bus from Pop to MK, then the resort monorail or ferry to Poly.
Pop to Boardwalk: Take the bus from Pop to DHS, then either walk or take the Friendship boat to the Boardwalk.
Pop to Boardwalk: Alternatively, take the bus from Pop to Epcot, walk through Epcot, out the Intn'l Gateway and walk or take Friendship boat to BW. You will need to use a day on your ticket for Epcot admission and it's about a half hour walk.
Fastest for either destination would be taking a taxi directly to Poly or Boardwalk.