I think that as you gain levels your radial quests get a little harder. Anyone notice this?
I'm at level 63 now and was sent to Dunwich Borers to kill some raiders.
The Sneak bobblehead is deep inside, but even after you reach it, you still have a long trek ahead if you plan on getting to the end and the legendary weapon. Make sure you have aquagirl/boy so you can breathe underwater. Maybe you could get to the weapon without, but I wouldn't try it.
It seems something weird happened here that I won't go into in case you haven't been there, but it's pretty interesting. lol
Bring LOTS of Stimpacks if you are going in. I went in without power armor because I've long since abandoned it's clunkiness.
And you should probably try to have your strong back maxed out because you will come out with a crazy amount of weapons/armor/junk and it's really handy to use your action points toward running and fast traveling.