The 43-year-old actress has returned to the gambling capital of US film the third instalment of 'The Hangover', reported Contactmusic.
"I don't like Las Vegas. People seem phony, they're spending all their money and it's sad. And it's also so cold with permanent air conditioning everywhere.
"I'm more the type who wants to be outside and look at a tree. I don't want to look at a machine," Graham said.
Heather is fond of the luxury trailers she and her co-stars Zach Galifianakis, Bradley Cooper and Ed Helms - stayed in during filming.
Heather does admit to following a similar food ritual.