"Good Day" is a midtempo soft ballad, written by Kilcher, Kara DioGuardi and Greg Wells and produced by Wells. The song opens with her standing in front of her fridge at midnight, drawling: "I might make a wish - if I believed in that shit."
Caroline Sullivan from The Guardian wrote that in the song "some of Jewel's twittery soul-searching has been replaced by healthy cynicism." Catie James from Blogcritics wrote that the track has "a playful, no nonsense attitude". Mike McQuillan from Yahoo! Voices wrote that "it's got one of those soaring "Everything's gonna be ok" choruses that soccer moms seem to love so much."
The video for the song is another allusion to the film The Wizard of Oz (In Goodbye Alice in Wonderland, Jewel mentions the "Goodbye yellow brick road"). The inside of the house is black and white, and outside is colorful. The pathway is made of yellow bricks. Similar to the story, the world outside of the house is originally a much nicer place, but slowly becomes less dreamlike and more cruel.