http://wheresmybackpack.com/2014/08/22/travel-theme-orange/ Where you can find more detail about the challenge.
Orange is the colour of saffron, pumpkins and apricots. It is between red and yellow on the spectrum of light, and in the traditionalcolour wheel used by painters. Its name is derived from the orange fruit.
In Europe and America, orange is commonly associated with amusement, the unconventional, extroverts, fire, activity, danger, taste and aroma, the autumn season, and Protestantism. In Asia, it is an important symbolic colour of Buddhism and Hinduism.
Kayaks = orange