If your duck boat doesn't double as a fishing platform be sure you ran all the excess fuel out of the engine. Might want to check the bearings on the trailer, too.

When fishing flood water it's imperative to know if the water is rising or falling. As long as it's coming up fish will spread out and look for food where they can find it. Flooded road beds with deeper water around them can be hot. When the water starts to fall concentrate your efforts where ditches and creeks dump into bigger of the same.

Ever had a hard time locating crappie in your favorite fishing hole? Eliminate the guesswork by setting out your own fish attractors where regulations permit. Old Christmas trees with a block or brick on the bottom work well as do stake beds. And if you don't have any out this year look for boat docks with lawn chairs and fish baskets on them. Crappie cover won't be far away.

Take care of your waders now and they'll take care of you next fall. There are plenty of commercial applications that will keep the exterior surface soft and pliable and they should be used before you hang them up.
And if you noticed a leak last season find it and fix it now. It won't heal itself over the summer.

If you ever hunt small sloughs by yourself without a boat you might want to consider a belly boat. That's basically an innertube with a seat. Many come in Advantage camo and work well (and more often, actually) for small-water fishing. Buy one now, fish in it to get used to it and you'll be a veteran next fall who can access out-of-the-way sloughs your buddies can only dream about hunting.