Meaning : Walk with no particular goal.
Example :
We were walking around in the garden.
After breakfast, she walked about in the park.
Synonyms : perambulate, walk about
Meaning : Walk around something.
Synonyms : circumambulate
Meaning : Behave in a certain manner or have certain properties.
Example :
He walks around with his nose in the air.
She walks around with this strange boyfriend.
Meaning : Walk randomly.
Example :
We were walking around in the neighborhood to see whether we could find an open drugstore.