Before fishermen discovered the edibility of fish, they used each catch as bait for larger species, hoping in the end to hook the biggest fish of all—friendship. Cast your line out for amiable adventure with today's Groupon: for $360, you get a half-day deep-sea fishing charter for up to six from Humdinger Sportfishing in Kailua-Kona (a $785 value). Charters are available Tuesday–Thursday and Sunday from 7 a.m. to 11 a.m. or 11:30 a.m. to 3:30 p.m.

Captain Jeff Fay utilizes more than 40 years of experience and a 37-foot Rybovich fishing yacht to whisk casters to deep-sea hot spots. Each four-hour charter adventure departs from Kailua-Kona in search of finned enigmas such as mahi-mahi, tuna, the white whale, shortbill spearfish, striped marlin, and blue marlin. Anglers need only bring their cunning fish-beguiling skills as the captain will provide all necessary accouterments, including tackle, bait and ice, snacks and family-friendly beverages, an on-board bathroom, and the principle soprano for a rousing sea chantey.

Shipmates assist in the cleaning process of water breathers that take the bait, as well as the packing preparations for a trip back to the fisher's home. Humdinger Sportfishing happily supports conservation efforts and offers fishers the alternative of tag-and-release fishing for spearfish after they give up the location of all their friends and agree to pose for a picture. Fishing licenses are not necessary, but booked charters must give seven days notice for cancellations.