They want to see boobs and lots of it. So make sure every mob has the 56 Display Id, I think that works for NPCs, might just make it a white Nelf, cant remember.

In all seriousness, they usally like PvP rather than questing, making some sort of PvP leveling might be usefull, as long complicated story-line quests tend to stray from the Inital idea and not work as well. Custom server is a good idea, but usally quite hard to pull off, usally people dont like PvP'ing on Servers that have "uber" or "imba" items that overpower donators or voters so much, keep the stats down to or around blizzards stats (But of course, make them a bit stronger for every 10 levels). Also, having lots of quests, i'm not sure people will spend alot of time leveling from 80-200 in quests, mabey having "vote for levels" and such, gets them higher quicker and you votes... and PvP at 200 must be unique, mabey a 'custom' battleground, or mabey a custom PvP system, like a Lua posted earlier - the one that gives titles for however many honorable kills you have, could be a good way to promote PvP. Things like that is what I'd be looking for.