I got tired of Skyrim after ... 80 hours. Please help.

So, I bought Skyrim and put about 80 hours into it. I played the main campaign and thought the final quests were awesome. I also did the Civil war Stuff (sons of Skyrim side), which I thought was a bit repetitive (go here, clear out fort x, go back, clear out fort y). I did the mage college stuff and about 3/4 of the companions quests. I ended up around lvl 40.

Note: I maxed out smithing and built some hot hot dragonbone armor in the late 20's. After that, the game became ludicrously easy. I was killing most monsters in 1-4 hits mainly. Before that, I was getting pwned by most groups of 2 or more monsters.

Anyways, I have no real interest in the thieves guild or dark brotherhood lines. (/ducks) I also wasn't super into getting the daedric artifacts because the formula go to x, kill or retrieve y, wasn't all that compelling. I did do the wobba-whatever-it's-called quest and the talking dog one, (plus others) neither of which was that compelling to me. The ease of the game wasn't helping things. I'll admit, it was pretty fun to absolutely wreck enemies with the dual wielding power attack. But it got old after a while.

I scanned through the quest list on a gamefaqs walkthrough, and couldn't see much that I was missing. This is all leading to my questions, the quantity of which there are two:

1) I understand that I overleveled the "radiant" content with my hot hot dragon armor with legendary weapons. Does the game get much harder at a higher level? Was giving up at 40 too early?

2) Is there anything else to do other than clear out various dungeons on the map if I don't want to do the thieves/brotherhood/daedric item quests?

3) (extra credit) Does the dark brotherhood line require murdering or can I do it in a morally positive way? I don't enjoy playing quests that make me do evil stuff. I just feel dirty.

Love,

Wackydavo

P.S. This forum/comment system is awesome. I hope all the hilarious Joystiq commenters make the jump.