Since the invention of inflation, prices for groceries have skyrocketed and rivers have become traversable. Enjoy the scenic side of economics with today's Groupon: for $10, you get an adult admission to an Illinois River rafting float trip at Arrowhead Resort in Tahlequah (a $22 value).

Arrowhead Resort allows rafters of all skill levels to go on a safe, sun-soaked drift down the idyllic Illinois River. Guests pile into the complimentary transport buses while an experienced guide briefs paddlers on safety rules and the intricacies of inland maritime law. Once on the river, groups of up to 10 float at their own pace for a 6-mile excursion down the tree-lined watery highway before landing downstream in the waiting backyard of the Arrowhead Resort. Guests should mind all laws and safety guidelines and make sure to wear sunscreen and shoes that are impervious to water’s cutting remarks.

Although not covered in the cost of today’s Groupon, Arrowhead Resort’s general store stocks plenty of groceries and provisions for furnishing a riverside picnic. In addition to victualing voyagers and weary travelers, the resort preserves the ancient culinary traditions of frontier river boatmen with one of the Illinois River’s only ice-cream fountains.