I would NOT keep "highest and lowest points on the session"...because poker is one big game afterall, and you're going to see all sorts of swings, and by keeping track, you're just teaching yourself to be results oriented.
I just write down date, stakes, win/loss amount. I keep it only for taxes though
(I do write down interesting hands/topics in a seperate notebook though. That way I can use live hands for leggo videos, or just keep them to improve my own play)