I love UO ^^
I don't live off new content personally, I love playing just to beat crap up day in-day out, and constantly push my character and my own skills to defeat ridiculous spawn.
Between you and me, I love the Sorceress Dungeon Level 3, the North side where TWO Balrons, an Elder Gazer and Twin Efreets hang out.. and either a Zombie, or a Mummy, can't remember which, but it's freakin' awesome!
(And I shat my pants everytime a Paragon Bally appears, there isn't much space, and the west tunnel is blocked with rubbble - pray to god you teleport fast enough over there before you're polverised by it's fists, or interrupts your spell!)
To the OP who's taking a break, you havn't LIVED till you have survived an hour of Solo Fighting down there... mind you, PvM may not float your boat that much... or you've accomplished that already? -_-
Anyway, I create my own excitement and adventure... and inadvertently lots of frustration too, 'cause I die easily, but in the long run I get plenty of satisfaction ^^
I rambled there, I love rambling, at least it's an optimistic, positive ramble.