It may be worth calling ahead to be sure that the swimming pool at Hotel Totora is open.
It's best to do this tour on your first day in Natitingou, as it will provide some great background insight into the Somba lifestyle. Transportation around town is mostly via moto-taxi. The small motorcycles go quite slow, but they don't have a helmet available to passengers. If you're opposed to your child riding on a small motorcycle without a helmet, ensure you make arrangements for a car to get you around town.
The evening is the best time to visit the market. Ensure you're finished swimming by about 3 or 4 pm so you can visit the market as the sun is setting.
It can get very hot, especially from February to April. Try to plan your trip at any time other than these months!