I take one day like that every two weeks or so, I call it a mental health day. I've done tons of stuff
Ski
Hike
Toronto tour
Hamilton Waterfalls
Niagra Falls
Dinner, hotel, breakfast
Montreal or Quebec City
Sail
Swim
Sudbury
Gardening
Cooking Class
Get pissed drunk
Bicycle ride
Take pictures
Centre Island
Shop for cool man stuff
The possibilities are endless.