Even Robert Redford knows that, if you're going to go on a 2,100-mile hike, then the best person to get camping advice from is Ron Swanson.

In this exclusive trailer for "A Walk in the Woods," based on the acclaimed novel by Bill Bryson, Redford plays Bryson as he and an estranged friend (Nick Nolte) attempt to hike the Appalachian Trail from Georgia to Maine. Many laughs ensue, especially when Nick Offerman shows up playing a sporting goods store clerk who shows Redford some camping essentials.

A Walk in the Woods - Trailer 1

A Walk in the Woods Movie trailer is here!

Posted by Moviefone on Wednesday, May 27, 2015

The Oscar-winner, last seen in Marvel's "Captain America: The Winter Soldier," spent at least a decade trying to bring the popular book to the big screen -- a book he (ironically) discovered before going on a trip himself.

"My wife and I were going on vacation, and there was this book sitting on my desk that had sat there for some while," Redford said. He went on to say that he had yet to read it because the cover reminded him of "another one of those environmental books" he often receives.

"[But] I took it along, I read it, and it was the first time I could remember laughing out loud so many times while reading a book."

If the trailer is any indication, the author's unique brand of humor is alive and well in "Woods" -- and Redford wouldn't have it any other way.

"I like comedy that has some wit attached to it, and Bryson had that," Redford said. "...Bryson skirts this line between just on the edge of sarcasm, what I would call sardonic humor, but it's funny, it's witty, but it's also got a level of sophistication."

"Woods," which also stars Emma Thompson, hits theaters Labor Day Weekend.