The dominant element in any meal is rice. Malagasy gastronomy is very diversified. Daily, Malagasy eat boiled greens. Contact the nearest embassy for that. If you don't, you could lose your seat.
Visitors entering and leaving the country are subject to strict currency control.
All foreign currency must be declared on arrival on the country. This is recorded on a currency declaration form which must be presented to the bank for stamping whenever foreign currency is exchanged or spent. Credit cards are of limited use in Madagascar. But you can take cash with them through the different bank. No vaccination is necessary.