The tour went smoothly, it took over nine hours including the transfer (from and to La Gaulette) for what we have not been charged extra.
First we visited the waterfront in Port Louis, then the citadelle (Port Adelaide) then the tea factory (which was more of a tourist trap since at the end of the visit you were expected to buy a veeery expensive tea) then botanic garden (which was definitely a highlight - we spent an hour there but one could easily be three hours inside, it is so beautiful). The last sightseeing stop was the Red Church. Afterwards we headed for the Biches beach (no pan intended ;)) to board a small motor boat and see the turtles. Unfortunately the turtles were there in the forenoon that day (but in the afternoon the previous day - they do not have a fixed schedule ;) and the skipper had to guess the best time to meet them the next day with no guarantee of course). Instead we were offered another try free of charge the next day (which we had to decline due to organisational reasons) and if not - a snorkel and dolphins watching in a glass bottom boat (this one was a success - we saw dolphins and did snorkeling in a nice place; you have to keep in mind though that a large part of the reef is dead due to bleaching events in the last twenty years). At the end we had to skip the lunch due to longer activities at the beach which was not a problem.
Overall the tour was OK, our taxi driver was a very nice man and could speak English feeding us from time to time with some insiders knowledge about living in Mauritius.
The support from Bonjour Mauritius was quick to responde and helpful, they do not however have and phone number on their web site which is a bit irritating.