Fly-fishing requires patience, precision, and the ability to fashion miniscule knots, much like building a zipline course in an ant farm. Hone your line-looping skills with today’s Groupon: for $75, you get a four-hour guided fly-fishing trip from Kirk's Fly Shop in Estes Park (up to a $150 value). All participants must have a fishing license, which can be purchased at Kirk's Fly Shop for $9.

The seasoned guides at Kirk's Fly Shop lead sportsmen on four-hour fly-fishing excursions in and around Estes Park and Big Thompson River. Groups of one to three explorers team with knowledgeable guides to customize trips, whether patrons prefer a trek to a scenic low-lying lake or to cast a line in the roiling magma at Mount Doom. The shop's fishing gurus guarantee that experienced fishermen and neophyte casters alike will catch fish, as the local waters abound with brown, rainbow, brook, and four-legged trout. The staff equips adventurers with all requisite fly-fishing gear besides flies, provides transportation, and silences disruptive belly rumblings with a snack and a drink. Trips are available year-round, so patrons can grapple with trout in the summertime and admire the fishes' holiday light displays in winter.