Unless my memory deceives me. Ran into her every time I turned around at GenCon a couple years back. Began to fear she thought my girlfriend and I were stalking her!
I like the idea as a sort of "capstone" game after all the settings are published and have a chance to shine in their own rights.
Something like this at the end of the 2E era would have been a lot of fun. Not that it wouldn't be fun now, I would just prefer to see in-depth setting information...
I think riddles and puzzles are fine so long as they serve to gate SIDE CONTENT, if the distinction makes sense (and I know there's no such thing for some styles of ultra-sandbox play).
It's whenever the players main goals are stalled by them that they become a problem, in my experience.
I tend to use a variant of option 1. I'll describe twisting corridors and such, but in much the same way I describe overland travel. I don't "zoom in" on the action until they get somewhere interesting.
It has its drawbacks, of course. The players know that if I zoom in on an unremarkable...