SavageExcrement's guide for level 100 is brilliant!
But for those not wanting to grind Super Mutants or have difficulty dealing with them and are unfamiliar with the Whitespring Golf Course XP farm, here's a short clip that takes around 5 minutes per run from Server to Server. Big thank you to SwampyPeet for showing me this!
Side Note: Both the stops (3:09 and 3:19) in the clip are where Bobbleheads can spawn too if you're going for that achievement also.
Sorry, this Game Clip has been removed
Whitesprings is full of Ghouls and usually a Glowing One or a Wendigo.
Levels vary from 9 to 62 depending on the spawn and averaging 100XP per kill.
It's a brilliant way to level up from 30 - 60
I'd suggest a melee build as they're usually easier to repair.
Whitespring's is a very popular place too, so annoyingly. There is often competition to be had when farming the Ghouls which makes the West Tek guide a better option to choose.