Like Easthill said, I ride my bike, do some gardening, long walks with my wife, volunteer work at the hospital.....
Who am I kidding? I stare out the window with my dog, waiting for the UPS truck. Driver always has dog biscuits and the dog knows this.
Search all the nooks and crannies for bikes and bike parts on eBay.
Scour the internet for more bike stores, blogs, forums, historical records, and pictures of bicycles.
Then there's the Scotch and chocolate.
(there's some demolition going on a block over and the rumbling of the trucks makes me look up expecting to see the UPS truck screeching to a halt at my door.)