1.
I would do the following:

1. Take time out to learn programming and complete some online courses on machine learning etc.
2. Deepen my knowledge of Physics and Statistics. Possibly, go through quantum mechanics again.
3. Do more outdoor stuff and treks every week.
4. Go running or workout every morning.
5. Try to solve some interesting real life problems in education and healthcare. e.g., low cost diagnostics or teaching science to kids in rural areas.