I sorta regret not working harder. But mostly I regret not doing more of SOMETHING. I look back and can't believe how much time I simply wasted. If I wasn't going to study I at least should have been doing something fun and interesting - go somewhere and look at something! get outside and do something! stop simply using up the hours doing very little... So much oppotunity to explore and learn and engage... mostly wasted doing nothing. Don't get me wrong, I had plenty of fun but there were a lot of afternoons and weekend days where I could have been so much more creative and proactive with my time... Oh whale! It all turned out OK in the end, I guess.