der Spaziergang
walk
A leisurely walk on foot outdoors that serves relaxation, recreation, or light exercise.
Am Sonntagnachmittag machen wir gerne einen Spaziergang im Park.
On Sunday afternoons, we like to take a walk in the park.

walk
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walk
A leisurely walk on foot outdoors that serves relaxation, recreation, or light exercise.
Am Sonntagnachmittag machen wir gerne einen Spaziergang im Park.
On Sunday afternoons, we like to take a walk in the park.

'Der Spaziergang' (the walk) is the nominalization of the verb 'spazieren gehen' (to go for a walk). It summarizes the entire action in a single noun.
Lass uns heute Abend spazieren gehen.
Let's go for a walk this evening.
The most common and natural verb-noun combination is 'einen Spaziergang machen' (to take a walk). This is the standard phrasing for expressing that someone is going for a walk.
Wollen wir am Wochenende einen Spaziergang am See machen?
Do we want to take a walk by the lake on the weekend?
The figurative meaning is almost always used in the negative expression 'kein Spaziergang sein' (to be no walk in the park). It means that a task is very difficult or exhausting.
Das Projekt pünktlich fertigzustellen, war kein Spaziergang.
Finishing the project on time was no walk in the park.
hallway / course / gear
'der Gang' and 'der Spaziergang' can both refer to going somewhere on foot. However, 'der Spaziergang' is a leisurely walk outdoors, usually for relaxation or exercise. 'der Gang' is more general and often purpose-oriented: you go somewhere to take care of something, for example to the post office or to the doctor. Learners may confuse the words because in both cases someone is walking. The difference is usually the purpose: a 'Spaziergang' is leisure time, while a 'Gang' is often an errand.

Nach dem Essen macht Anna einen Spaziergang im Park.
After dinner, Anna takes a walk in the park.
Der Gang zur Apotheke dauert nur fünf Minuten.
The trip to the pharmacy takes only five minutes.