That was so nice when I got an 8 year old indoor cat. You could see this world of wonder in her eyes, as she didn't know where to look and where to sniff first.
With time, I could let her run free but supervised in a shared apartment building garden. She always went to the same pine trees and couldn't get enough sniffing them. Also jumped on the window sill of neighbour cats just to hiss at them from the outside.
When I went to neighbours, for example to pick up a package or talk about something, she trotted next to me through the hallways like a well-trained dog and sat next to me when I talked to a neighbour. The whole stairway and hallways were another great adventure to her, sniffing and clawing doormats etc.
Great cat. But a little disappointed - I was expecting legendary mischief stories.