I best conference I spoke at was in Las Vegas. I went for 5 days: registered, gave a 30 min speech on day one and for the rest of the time, bar the conference dinner and drinks that I of course attended, I just shopped, drank and played Blackjack.
I was also on the Board of a health and safety organisation in the USA for 5 years. We met twice a year alternating between Washington DC (dreadful place) and Seattle. I recall going into a bar near to the White House and saying to this bloke that he worked in the Secret Service. He asked me how did I know, I responded that he was still wearing his security badge with his name and role. What a jerk, he did not like it when I laughed at him.