I go online, and/or watch TV and DVDs. Also cleaning the house & doing laundry are productive, and catching up on little house projects.
Had plenty of experience doing that in North Dakota, where my disabilities further kept me house-bound in bad weather (and one of the reasons I'm now in Florida).
One time I was trapped in my townhouse for 3 days, when drifting snow that had packed against the front door kept me from opening it outwards. The lower windows were also covered over, and though I might have tried jumping from the upper windows, closing them after me and climbing back in were problems.
On the third day the roads had cleared enough that my BF was able to drive over, bringing a shovel so he could clear my door from the outside. (My own snow shovel was in the detached community garage outside, and I doubted whether I could bail out of a back upper window, make my way through the 7-foot drifts to the garage, and shovel myself back to the door, disabled as I am. Had I failed partway I would have been in serious trouble)
So I just occupied myself with the things I mentioned above, and also played the piano. As a veteran North Dakotan, I had plenty of food, always prepared for that possibility.