What can I do to trick my 3 year old into walking longer distances?

1. You can announce that he's too heavy to carry. 2. You can agree to only carrying him for short distances (only until that post, for example) then he has to walk from there. 3. Have him chase after a toy like a remote control car (be mindful of safety). However, do remember that your child has shorter legs than you and may tire easily. So if you sense he's tired, give him a hand!