https://www.nexusmods.com/skyrim/mods/74638/
Option 2 - JK Cities (Looks Good, Hard on Performance)
All in One - https://www.nexusmods.com/skyrim/mods/61035/
Option 3 - Towns and Cities Enhanced (Modular)
Part 1 - http://steamcommunity.com/workshop/filedetails/?id=79384336
Part 2 - http://steamcommunity.com/workshop/filedetails/?id=119264468
Extras for Options 2 and 3
Helgen Reborn - https://www.nexusmods.com/skyrim/mods/35841/
Winterhold Rebuild - https://www.nexusmods.com/skyrim/mods/50491/
Legendary Cities - https://www.nexusmods.com/skyrim/mods/47989/
Oakwood - https://steamcommunity.com/sharedfiles/filedetails/?id=97501644
Oakwood + Hearthfire Patch (use both mods) - https://steamcommunity.com/sharedfiles/filedetails/?id=100934504
Windhelm Pit Fighter Faction - https://steamcommunity.com/sharedfiles/filedetails/?id=119305443
Pit Fighter Travels Expansion Pack - https://steamcommunity.com/sharedfiles/filedetails/?id=125029519