Thursday is the market day, the most important in this area. Nomads people coming from the interior dessert to this market and dont need to go close to the river.
You can rental a pirogue around 1.000CFA one hour (ask any of the fisherman) and explore the birdlife of lake. It is special nice at the sunset.
Can be very interesting visit the villages around Tera, most of them are tuareg or Peul.