I had heard that mangrove watersnakes were to be found in the mangroves along the edge of Matheson Hammock Park, but I hadn't been lucky enough to find one in several visits. Fortunately this park is easy walking distance from my mother-in-law's house, so I usually have an opportunity every year or so to look again. The end of December isn't the very best time to find snakes, but in South Florida almost any time of year will do.