Spruce - it won't get slippery or slimy when wet -
That's what they used to use for the planks on bass-stands...
And no, I wasn't there at the time...
"There is no royal road to this heavy surf-fishing. With all the appliances for comfort experience can suggest, there is a certain amount of hard work to be done and exposure to be bourne as a part of the price of success." From "Striped Bass," Scribner's Magazine, 1881.
Best one I built was out of reclaimed white cedar from an old fence. Use new white cedar or rough spruce for framing. (You can "age the new stuff with a baking soda/ water mixture sprayed on) Used 1x4 mahogany for decking over drain. Do not skimp on square footage.
“Americans have the right and advantage of being armed, unlike the people of other countries, whose leaders are afraid to trust them with arms.” – James Madison.