One thing that really helps with being single is whatever it is you are really enthusiastic about. If you haven't found that thing yet, now is a great time to start exploring the world of really neat things that you can put your life into. "Something I am enthusiastic about" is SO much better than "something I am doing to take up time so I won't be bored."
For me, for example, it is music. I can talk about music for days straight (so take that as a warning, don't start talking about music around me or you will be bored to tears.) I have an 88-key semiweighted keyboard connected to my computer, and in the computer I can make soundtracks. I use the soundtracks for singing songs at church without adding more to our already-overloaded piano player's plate. I also have more than 2,000 tracks from old records that I have recorded off, edited and saved in digital form.
Free time? What is that? There's always more stuff I want to do. This is something I am enthusiastic about, something I really like and I think it's really neat and it is useful for singing songs at church... and all the music I have in my collection is useful for playing at work. All my music is christian, but I can find a style in my collection to fit any coworker's taste.
What are you enthusiastic about? Architecture? Playing an instrument? Biking? Pottery? Now is a great time to buy that electric pottery wheel or those upgraded bicycle shifters, while your money is YOUR money.
Can't think of anything you're enthusiastic about? Great! There's a really big world full of stuff to explore. And now that you're single, this is a great time to be trying stuff out.