Two American sporting superstars have been enjoying an adventure-packed holiday in the south.

Retired IndyCar driver Danica Patrick and her Green Bay Packers quarterback boyfriend Aaron Rodgers have been spending a romantic getaway in New Zealand, checking out Queenstown and Milford Sound.

Ms Patrick took to Instagram to share holiday snaps, including a photo of her bungy jumping in Queenstown and the pair kayaking in Milford Sound.

She revealed her fear of heights in the bungy photo caption, saying the experience didn't quite fix that.

"But I just like to know that if I had to do something uncomfortable, I sure as s**t could.''

She also described Milford Sound as "quite beautiful''.