There are a couple of ways to remove water marks from wood. White toothpaste seems to have the best results. Simply rub it on with a cloth for a few minutes until you see results. See the full instructions and other methods here.
DIY World Map Wall Art Tutorial (using the Silhouette Cameo) Could be used with any picture! How great would this world map be with little stickers of where you have traveled! Would be great with repurposed wood! I love this idea!