I haven't been to a conference in Vegas since 1983! I don't gamble at all, so the only interesting diversion I found for the evenings was "Fly-Away", the vertical wind tunnel that simulates parachuting.
p.s. when at conferences, I attend all the sessions I can - I don't skip out early for personal activities.
also, we have no travel budget this year, so will not be attending any out-of-town events.