If you only get one Halloween-themed Skyrim mod this year, this is unquestionably the one to get. It's got everything all in one bundle: new quests, new locations, and new skins. To top it all off, there are even pumpkin and Halloween light decorations placed everywhere to complete the vibe.
Sadly, this mod isn't compatible with Skyrim: Special Edition, and it takes a little elbow grease to get working in the vanilla game because it's actually three different mod install files instead of one. But the results are well worth the work.
On the plus side, more content and updates are added every year, with the 2017 additions being worked on as we speak.