No car option and depending on mood of child in stroller....

option 1: avoid the crowds - go to the Main Street Bake Shop, have a snack and wait for the crowds to thin out. Then take the B/C bus back to the resort.
Main Street Bake Shop menu....
http://www.allearsnet.com/menu/men_msb.htm

option 2: depending on when Wishes ends and the hours of EPCOT.
Talk the monorail from MK to TTC - transfer to EPCOT monorail.
Stroll through EPCOT to the World - stick to the right side towards Canada, Unitd Kingdom and France - head for the boats to the resorts.
Take a nice boat ride back to the Beach Club.

option 3: pay for a taxi, about $15, but would be best for a tired, cranky child. Ask at City Hall when you first get to MK were to get a taxi after Wishes.
Our best option, and best use of time, is to go to the Main Street Bakery and wait for the crowds to thin out. But that is what our family likes to do.
Do what is best for your family.
Enjoy
