So... what do I do for fun? (On the PC, of course) A warning, do save before attempting any of this sort.

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Spoiler Turn into a werewolf in the middle of town... Whiterun is a favourite. Unfortunately, that can have nasty side-effects.
* Using the console, spawn a Draugr Deathlord in the middle of town... while hidden, of course.
* Same as above, but swawn a Forsworn Briarheart in the middle of town... even more fun. These guys are nasty with a capital N.
*
Spoiler Cast the Nightingale power of Subterfuge in the Castle Dour. Watch Tullius and Rikke go at it and not in a pleasant way

Of course, casting that anywhere is rather entertaining. Again, beware that innocents could be killed doing this sort of thing.
* standard, run-of-the-mill murder. In broad daylight. In full-view of the town guards. Not recommended for those with weak health numbers, or low armour ratings.
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Spoiler Mess around in Sky Haven Temple (blatent thieving, etc.) and see how long before I get some sort of reaction out of Delphine and Esbern. (not long, naturally). Not for weak characters.
* Drop food on the floor of the Bee & Barb Inn in Riften, watch people fight over it.
* Visit Bard's Leap Summit
* Have a long, hot soak in the hotspings in Eastmarch.
I could go on, there's lots of ways to mess about in this game.