How to make running more interesting?

I`ve been running for a month and reached 5km as max length within 40-45minutes.

First few weeks it was really interesting, because it was very hard. Now it became pretty boring. Of course I`m not going to stop running, because it is the best sport activity for me. Just wonder how to make running more interesting. Does anyone has ideas?

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Upd: Thank you all for so many advices. There are pretty unique ideas i wouldn`t come up with for my own. I don`t like listening podcasts of music during the run, because it only exhausts me, and i don`t have friends interesting in running. But i`d like to try new roots, experiment with my training programs and use some mobile apps.