Oh so many interesting and important things! And YAY about your gf, congrats! Yeah, now it's time to think what to do with your life, and don't worry, when you think you've chosen the wrong direction, just turn a few degress and start something else
Hummm, what to do in your free time? How about you make a little list with things for every day that you have to accomplish? Like:
1) Draw a hornbill (google that if you don't know what it is )
2) Ride your bike for an hour
3) Write down snippets that you hear from people talking and try to create an epic story out of it when you're back home
I don't know if that's too random for you, just be creative!