At Home in Gormenghast
"Web-wandering" doesn't really mean that people like to spend time going round in a cyber-maze. A site that has grown like Gormenghast Castle will lose more web wanderers than anything else. Whatever you do:
don't plan your site logically
don't do an organization chart so a logical structure emerges unannounced
don't develop a clear navigation system (have directional markers mean different things on every page!)
In essence, don't do anything to let those intruders know (1) where they are or (2) where they want to get to (aside of away from your site). IF you've already put up a well-organized site, redesign it -- see if you can make a Celtic knot out of the links on your site!