Ideas to make running more fun:
1. Go tour some different places. A lot of parks, even small ones, have trail systems... go run them.
2. Get a GPS watch or an app for your phone and just take off through a different part of your town/city and see whats out there. Set the GPS to alert you when you're at your at 1/2 your desired distance, then turn back and try to find another route back home or to your car.
3. Integrate interval workouts in your normal run. You can experiment or get interval sets from books (Daniels' Running Formul) or web sites like Runners World. Basically start with a warm up jog, then you could do pyramid sets based on your run pace or heart rate, You can do sprints for 20 seconds with 1 minute rest, etc..
4. Add calisthenics, after a 10 minute warm up jog, run at a reasonably fast 10k pace and at every 2 minute interval in your run add 10 pushups or burpees or other, then continue.
5. Run with a friend or a running group. Having someone else to talk to on lighter jogs, or to be a little competitive with on faster runs, can make it much more fun.
6. MUSIC. I ran for years with no MP3 player, when I added one it was like a totally different experience.