MadaMax (011-261-20-22-351-01), Gilles Gautier's company, charges about $90 per person per day, all-inclusive, for trips on any of the 13 rivers it floats.
Build a 15-day custom tour, including stays in Périnet and Isalo national parks, with Aardvark Safaris (011-44-1980-849160) for $4,250 per person.
MadaMax charges $50 per person per night at both camps—Nosy Hara and Tsarasoa— including full room and board in tents or simple bungalows.
Doubles at Tsarabanjina start at $140 per night, including three meals and snorkeling. Doubles at Iranja start at $285 per night, including air conditioning and a mini-bar. Both can be booked through Aardvark Safaris.