St. Martinville â?? The Cajun Coast Visitors and Convention Bureau in Patterson, just a few miles beyond the historic mouth of Bayou Teche, is the official end of this weekendâ??s inaugural Tour du Tech canoe and kayak race. But donâ??t tell St. Martinville. At 50 miles from the start in Port Barre, on Bayou Courtableau, St. Martinville figures plenty of paddlers will call it quits before they have to portage around the Keystone Lock and Dam and enter the Lower Teche, with its sluggish current and rafts of water hyacinths. Officials here have even hired the legendary Wayne Toups to entertain at what might be the most popular, if unofficial, finish line.