My 2nd year was also my least-favorite. I didn't have my incredibly awesome section mates, section leader or as stellar a professor lineup. By 3L things were rocking again - got the classes I wanted, found my niche again and life was good. For me the Olin Fellowship and law and econ stuff really suited me well along with rigorous courses like fed courts
I'd have done the fellowship and started my own writing earlier had I known how awesome it is. Don't know if you'd have the same experience, but perhaps doing some of your own scholarship is the way to bring back the fun
Many of my friends also seemed to really enjoy getting involved in journal/law review work (I didn't particularly care for that type of work). I think the key is to get involved beyond going to classes - scholarship, journals, student bar association or some sort of activity of that nature is good.