To do a walk
Hi!

I found this example:

Have you ever done the Three Peaks walk?

Does this mean we have to pay to visit / go for a walk in the Three Peaks?

Question

To do a walk
Hi!

I found this example:

Have you ever	done the Three Peaks walk?

Does this mean we have to pay to visit / go for a walk in the Three Peaks?

Answer

In this case "walk" is a (hiking) trail, usually involving a pre-determined route, signalled in some way so that walkers can follow it.
"To do that walk" = to follow/hike that route.