Things you can do with no internet:
Have a cup of tea. Tidy up the house. Laundry. Listen to music. Clean the nasty stuff out of the fridge. Carry out the trash / recycling / compost. Write postcards. Read books. Walk on the treadmill. Watch some of your backlog of video podcasts. Do dishes. Take a nap.
Things you could do with no internet but actually didn't get around to:
Draft blog posts. Hand wash delicates. Sort through old stuff and take pictures or scan things and add to the Goodwill box / recycling / trash. Sweep the front steps. Sweep the back porch. Make soup stock.