watch it on the Oak
Per Ross, Oak can blacken w/direct water contact. Most boat interiors you see these days are 95% veneer which helps the stability. Solid hardwoods move around a lot with moisture changes. Very generally, the softer the wood, the greater stability. Teak, Cypress, White Pine, softer Cedars, are pretty stable. Black Walnut ($$$) & Cherry pretty good. Oak, Ash, Maple, Hickory are going to move on you. A lot does have to do with where you live. North bone dry in the winter, wet in the summer. As you go south, less fluctuation, stays damper.