All dogs should be able to get out and enjoy the sights, sounds and smells available on a walk. Think of it as a smorgasbord of stimuli. It's awesome! It provides mental enrichment as your dog experiences his surroundings. Who was here? Who is coming?
One thing it does not provide is a  physically tiring outlet.

How many of you return from a walk, thinking your dog is pooped and will simply find a cosy spot and go to sleep? Only  to find he is running around looking for a toy, a game of fetch or otherwise trying to engage you in play?
Walks are a necessary part of your dog's daily regime but they do not tire him out or burn off energy. Think of them as a warm up before real exercise.

If you want to have a dog who is a bit more inclined to take a nap after a walk, consider doing some kind of aerobic activity before your walk. This will burn off some energy and likely lead to a more relaxing walk.

Try if for 2 weeks and see if it makes a difference.