Grammar fix
within walking distance
close enough to walk
Close enough that you can comfortably walk there rather than take transport.
collocationB1common
Hear it in context
Notice where the phrase sounds natural.
The hotel is within walking distance of the beach.
A: Should we get a taxi?
B: No need — it's within walking distance.
Fix the pattern
One small grammar move makes it sound right.
Not: The beach is in walking distance.
Say: The beach is within walking distance.
The fixed phrase is 'within walking distance', not 'in walking distance'.