I recently came across a mod that really changed the game quite literally for me.
The Superb ENB mod changes the look of skyrim to make it look as real as possible. I could go into detail but thats really all you need to know. The fog is foggier, and the nights are darker. The dark nights being the most appearent and changing the play style a bit. You actually need your light spells now and I would highly advize not traveling at night. You’ll find yourself in places you don’t want to be unless you cheat or are very leveled up.
Anyways this mod can be found here. enjoy!