To see a map of the whole trail, check out Lake Wobegon Trail.
Willows, sallows, and OSIERs form the genus Salix, around 400 species of deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions of the Northern Hemisphere. Most species are known as willow, but some narrow-leaved shrub species are called osier, and some broader-leaved species are referred to as sallow (from Old English sealh, related to the Latin word salix, willow). Some willows (particularly arctic and alpine species) are low-growing or creeping shrubs; for example, the dwarf willow (Salix herbacea) rarely exceeds 6 cm (2 in) in height, though it spreads widely across the ground.
Willows are very cross-fertile, and numerous hybrids occur, both naturally and in cultivation. A well-known ornamental example is the weeping willow (Salix × sepulcralis), which is a hybrid of Peking willow (Salix babylonica) from China and white willow (Salix alba) from Europe.
YELLOW is the color of gold, butter, or ripe lemons. In the spectrum of visible light, and in the traditional color wheel used by painters, yellow is located between green and orange.
Yellow is commonly associated with gold, sunshine, reason, optimism and pleasure, but also with envy, jealousy and betrayal. It plays an important part in Asian culture, particularly in China.
Combine 
with something 
and you have a cache and a hiding spot!!!
So, head on out to find this cache, but please be careful.