A company called Tektinox made a video showing the importance of social distancing. They showed a map of a Ft. Lauderdale beach that was being used by spring breakers. The company was able to zero-in on the data of mobile devices used on that beach during that time. And then they tracked those devices as they left and spread out to half of the country, mostly in the Midwest and east coast. A few devices even made it to the west coast.
It is important to note that not all of the Spring Breakers were exposed to Coronavirus, but i think you get the point.