I work out of town for weeks at a time, and i'm away from my usual hobbies and the means to do them.
So, this has forced me to think outside of the box a little.
There is always something to do; you just have to go do it.
Some things that come to mind are - going to the movies, going to the library, going to the mall (you don't have to shop, it's fun to get a drink and just people watch), go on a walk, volunteer for an organization that helps others, go to watch a baseball/softball game at a local ball field (usually free), take a bicycle ride, hike a nature trail, find a social club that interests you, join a gym, take up a new sport like tennis or golf. Get yourself out of the house!
Then there are the things you can do at home. Draw up a bubble bath, take a nap, read a good book, rent and watch a movie, fixup a room in the house.
Its a big world out there. Get out in it!