I took 18 to 22 units every quarter. There was no time to party. Mornings started on campus at 7 AM (after a 25 mile drive) to teach my physics class. The day usually ended around 11 PM as I was wrapping up work in the biochem labs. In between I had multiple lectures to attend and a little time to track down food. UCSD didn't have much to offer on campus between 1974 and 1976. A drive down to Clairemont to eat at the Jack-in-the-Box was my usual solution...or a brown bag lunch. I looked forward to a late lunch of teriyaki chicken with my biochem prof on Wednesdays. There was a grill near the Revelle Provost Office that was open a couple days each week.
You were a science major, right? Liberal arts doesn't require all the courses you mentioned.... so I'm not sure what your point was... :)