> Block traffic? Tweet? Cut off ties with friends and family that don't share your political beliefs?

All of the above. Get involved with political organisations, NGOs, volunteering groups, go to protests and network with people there. So that when the government starts doing something that approaches a police state, you, your group, and many other groups of people will be out there ready to make their will known. Block roads, burn tires, occupy squares, remove cameras, etc. Is is easy? Not at all. Can you do it alone? No. Is it worth doing to avoid living in a police state? Yes.

Take a look at Russia if you want an example of what widespread political apathy leads to.