The best way to go from:
1. Pop to Beach Club Resort for 5:00pm dinner at Cape May.
If you are park hopping that day, you could wait for either a DHS or Epcot bus (whichever one appears to be arriving more frequently). Once at DHS, you could take the friendship cruise. Once at Epcot, you could sneak through the park and go out through the International Gateway. BC is a five minute walk from there.
2. Pop to Grand Floridian for 8:00am breakfast at 1900 Park Fare.
Probably a bus to the MK and then hop on the resort monorail is about the only reasonable option. You could go to Epcot instead, but then you would add an additional monorail transfer.
Either way, I agree with the poster who suggested a 75 minute transit-time allowance! Have fun!