You must have an incomplete and slightly nagging things-to-do list. Work on a few of those.
Lol...or just sleep a lot. That's nice too.
Hello Daniel! There is so much that you can do in your free time! However, I will suggest that you avoid getting into activities that will cost you money. Mobile games will help you a lot and what's best is the fact that most are free-to-play. Titles from Nintendo or Gameloft come with tons of action and are hence ideal if you are looking for an adrenaline rush on the go. I also remember having a lot of fun with my friends at the gym! We would train together and also play badminton two or three days a week. Here is a list that will certainly help you out. Do have fun!