To leave the bedroom if I'm home all day. I didn't let him explore the house yesterday, so he took his first opportunity to grab freedom today.
I haven't bunny proofed my entire house yet, and he's still really young and I want to keep him in a smaller environment, so he stays in his pen when I'm away and roams my room when I'm at home. I did get a rug for my room, but I didn't really expect him to spend time outside of my room until next fall, and even then I think he'll be relegated to my room if I'm not home, mostly because I have better climate control in there.
On that note... Do you think a rabbit would use a dog door or something? I'd like to eventually be able to close my door (climate control) but still let him come hang out with me when I'm doing stuff in other parts of the house.