What kind of cooler should I get for a week on the river?

Get a rotomolded cooler – the thick plastic, heavy insulation, and rubber latches keep ice for days, not hours. Cheap coolers lose ice in 2-3 days, while rotomolded ones hold ice 5-7+ days if you pre-chill and use block ice. Brands like Yeti, RTIC, Pelican, and Orca all work similarly; pick one that fits your boat (45-65 quarts for a group of 4-5) and has thick walls, a freezer-grade gasket, replaceable latches, and tie-down points.