The thing with a 100k is party is that it needs to get organized after the fact. And when everything is done and the party finally takes place, 100k will already be old news.

It was the case at 1k and at 10k that the price just shot through it and nobody really cared anymore about any party afterwards.
 
But if it's not just talk this time, I think a city would be better than some remote place (like an island or so).  My picks: Vegas, Tokio, Berlin, Barcelona