Diane and I have been experimenting with having The Misty Cat explore the hallway environs. Our condo is a relatively small place for her, especially compared to Denison, where she even had an enclosed porch to go play and stalk in.
Each night around 11pm, we open the door and let her out. We're at the end of a pretty long hallway, so she has a lot of space to explore. She's walked all the way down to the elevator by herself and even into the stairwell up to the 9th floor.
One night she even went down to the basement with us to throw away the garbage, although she cried during the whole elevator ride down. It's strange to see her so scared, because usually I am the one that is the scared party.