This is going to sound insensitive, it's not meant to be.
"Taking a dog for a walk" is usually done to give the dog three things.
1) Exercise. Necessary for those dogs that don't have a yard to run around in. If the dog can get sufficient exercise in it's own area, there's no need to take it out.
2) Visual/aural stimulation. If you're going to take the dog out in a "stroller", don't use the one that looks like a baby stroller. Get the one that has the mesh screen all around. This gives the dog full line of sight, and allows it to sniff at trees, etc. ... which you'll need to push up to for the dog's benefit.
3) Poopin' and peein'.
All of the above reason for taking a dog for a walk are, for the most part, negated by putting it in a baby stroller. Especially since it's been proven that dogs don't need the walk as much as human's do.
If your puppy's got plenty of exercise room in your yard, and places to "do it's business", it doesn't actually need to be taken for walks.
All that said, I fully understand the desire to "payback" the animal's love.