Anybody who surfs knows there's often plenty of downtime waiting for the perfect swell to come along. So what do you do while you're waiting around? Option 1: Nothing (boo). Option 2: Fabricate your own ready-made waves, via a makeshift current pool hooked up to the Waimea River, one of the longest rivers in the Hawaiian Islands. Kudos to Stephan Figueiredo, Dennis Tihara, Gabriel Pastori, Diego Silva and Felipe Cesarano for their up-and-go-get-'em.