The Buffy The Vampire Slayer star hopes to hit America's national parks with boyfriend Rick Fox as part of an ambitious vacation.
She says, "I'm kinda an outdoor junkie. I'm gonna take an Airstream trailer and stop in all these cities."
McConaughey took a road trip across the States with a customised Airstream to promote his movie Sahara in 2005.
His home-from-home on wheels now sits atop a bluff overlooking the Pacific Ocean in Malibu, California.