The taxis in Ziganchor have a fixed price, one price for the day and other at night.
Being an european turist, it'is not a reaosn enought for paying more for taxis or another things than the rest of the people.
Unique Suggestions: If you have more money, buy more things, try that it were local gods and not ever buy to the same sailors.
Fun Alternatives: If you want to give some money for free, give it to a invalids, or old homeless. Don't give it to a taxists or people that have, more or less, a rentable bisenss yet.. Not all the people in Africa is poor or need the same help.
then its more humid, more mosquitos, and more malaria too. If you go to a places without electricity(villages), you can have a hard hot nights.
Unique Suggestions: take malaria medicins and antimosquitos.
Fun Alternatives: Its better to go from setember to june. If you go just at the end of setember, you can see the green Casamance too.