Watch TV or movies. Thats what I do.

You can also spend some time on QL its absolutely free.

Join up in some voluntary activities and contribute socially if you can (its absolutely free and very satisfactory).

Teach some kids free Science, Maths, English or any sport if you are good at (its absolutely free and very satisfactory).

Take some topic depending on your interest and do a thorough research and then publish it.

If you are interested pursue higher studies. Add couple more qualification under your name.

I have mentioned what I would like to do now is your turn to select any.

Peace.