38. going to Stony Creek Cave (or some cave along those lines) northeast of Riften, you can use the wuld shout to jump on some rocks and warp across onto the waterfall on the farthest chamber. follow it along to find a mysterious dwemer ruin (without spoiling what happens) you can slink in, grab treasure from the final chest, and escape. congrats, you just entered the end of a dungeon. there's nothing else of interest here except an expert locked chest at the bottom of the lake.
39. Out of all of the destruction schools, while they all have their ups and downs, Lightning is technically the best. nobody is resistant to it, although nobody is weak to it. Also, it's final upgrade perk is the most efficient, killing enemies by disintegration if shot by lightning below some 20% health or so. don't believe it?? Nords are 50% resistant to ice, plus blizzard has a strange glitch where all your magic and ice resistance applies to the enemy, making blizzard one of the worst spells in game. Fire is good, plus bleeding damage, but if you're in solstheim almost everyone is a dark elf and it does hardly no damage. plus the only enemy that is slightly resistant to lightning is the storm atronarch itself.
40. this is the best one I know yet. if you get the Prowlers Profit perk, all treasure chests have more gems and stuff right? this can be obtained by doing the baranziah's quest... BUT.
Go to a Nordic ruin. see all those urns? EACH. SINGLE. ONE. counts as a chest and has at least three or four gems (some flawless) in it. see my sig, my Eyes-on-gold character had OVER FIFTY FLAWLESS AMATHYSTS. this is the best way to get money that I know of yet. its amazing. while this applys to all chests, and even the specific dead greyish female draugr you find in the crypts, the Nordic ruins have the most urns and chests. you will find maybe three empty urns in your whole journey from this.
41. Having the Necromage perk from the restoration tree and becoming a vampire makes all your spells twice as effective on you. grand healing now does 600+ healing to you. all enchantments are now 25% stronger, thus making 23% reduction to a school 27 or so. this also applys to magic. 51 magic suddenly becomes 71. etc.etc.etc. and this also works on a few perks, but none of the 5/5 perks.