It is interesting to see the summer of love generation start wagging their fingers at millenials about morality. I will actually agree with Bill that the garden variety spring break kid in the early 70s would just be drinking alcohol. But for those who were aligned with the hippie/free love movement, everything and anything was going on. LSD was very common. Heroine was also very much in circulation. Most notably, the idea of taking drugs was seen not as deviance, but as a positive. People were exploring with drugs. Today, people taking drugs generally understand that they are just getting wasted and make no claim of some higher social goal.
But Bill misses the real problem with spring break. The booze industry puts millions of dollars into massive spring break events to encourage kids to binge drink on their product in hopes of getting lifetime brand loyalty. The entire "get crazy" spring break phenomenon that creates a culture of extreme deviance is largely a creation of the big booze companies. The drug culture finds easy pickings in that kind of environment as people are more likely to try drugs when their judgment is impaired by alcohol.