I think I'd walk first.
You can never have too many bikes. I't always useful to have a backup incase your primary bike is under repair. He could atleast go pick up a single speed huffy from the local MegaMart.
But atleast now I know why these bikes designed for 30lb toddlers are built heavier than a full sized bike. If my bike was the same relative weight as my daughters bike it would weigh over 150lbs.
Craig