The Elven Catamaran is a thing of beauty - robust, streamlined, and fast enough to outrun anything on the lake, natural or supernatural, short of a wendigo at full tilt (and even that will depend on wind conditions.) The only downside: they capsize easily, and require a great deal of skill to manage. Get training - a lot of training - from the usually taciturn elves before you try to pilot one, unless you like long trips through cold water.