I listened to
Revolver this morning and noticed a couple features in "Good Day Sunshine." After "We take a walk," there's a descending piano phrase (A G# G F#). This phrase is step-wise chromatically, so there's something of a sense of the steps involved in "tak[ing] a walk."
The clause "She feels good" is a bit ambiguous. This could be either a description of the girl's disposition (which the rest of the line ["she knows she's looking fine"] seems to suggest) or a comment by the narrator about her body.
