Other than reading books and watching series, I might be doing any one of these during my free time:

1. Badminton

2. Cricket

3. Swimming (Basic)

4. Chess

5. Carroms

6. Karate (Blue Belt)

7. Fitness (Gym, Yoga etc;)

8. Gardening

9. Cooking (Basic dishes)

10. Music (Mostly Melodies)

11. Eating or Sleeping :)

Also, I started learning Keyboard :)