We're Going on a Leaf Hunt by Steve Metzger illustrated by Miki Sakamoto

Three children of different ethnicity tromp off into the great outdoors to look for leaves.  The words/rhythm are based on "We're Going on a Bear Hunt" but do not  sound as pleasing as the smooth rhythm of the original.  
A good book to read before going out on a leaf hunt with your child.  Leaves the characters find are maple, birch, hickory, and red oak.  The font color changes to reflect the scenes in nature.