When you head out to the lake, take an old towel, old shirt, of some type of rag with. When you're done running, or even if you're waiting for a battery to charge, wipe the boat off. It doesn't need to be totally dry, since it will probably get wet again, but it will keep those nasty looking water spots off your boat! Also, it gets any mud off before it dries on the hull.

Although a simple tip, it an important one.  No matter what type of hull you have (wood, fiberglass), a simple cradle will protect it while you transport it to the lake.  It will also make a great display stand.