Lake Alaotra is the largest lake in Madagascar, located in Alaotra-Mangoro Region and on the island's northern central plateau. Its basin is composed of shallow freshwater lakes and marshes surrounded by areas of dense vegetation. It forms the center of the island's most important rice-growing region.

The rich flora and fauna of Lake Alaotra includes a number of locally endemic species such as the Alaotra gentle lemur (Hapalemur alaotrensis), which is the world’s only primate found exclusively in wetlands.

Here's an itinerary for a tour to Lake Alaotra:

Day 1:

• Arrive in Antananarivo, the capital city of Madagascar.
• Meet your tour guide and transfer to your hotel in the city.
• Spend the rest of the day relaxing and exploring the city.

Day 2:

• After breakfast, depart for the Lake Alaotra region, which is about 220 km east of Antananarivo.
• Stop at the town of Ambatondrazaka for lunch and a short visit.
• Continue the journey to Lake Alaotra and arrive in the late afternoon.
• Check-in at your accommodation near the lake.
• Enjoy a relaxing evening and dinner.

Day 3:

• After breakfast, take a boat tour of the lake to explore the diverse fauna and flora of the region.
• Visit the fishing villages around the lake and learn about the traditional fishing techniques used by the locals.
• Stop at the islands of Befotaka and Ramena, which are important bird habitats, and observe the various species of birds that inhabit the area.
• Return to your accommodation for lunch.
• In the afternoon, visit the Lake Alaotra New Protected Area and learn about the conservation efforts being made to protect the unique ecosystem of the region.
• Return to your accommodation for dinner and a relaxing evening.

Day 4:

• After breakfast, visit the village of Soarano, which is famous for its handicrafts made from papyrus, a plant that grows abundantly around the lake.
• Take a walk around the village and see the local artisans at work.
• Return to your accommodation for lunch.
• In the afternoon, take a walk around the lake and observe the unique plant species that grow in the wetlands around the lake.
• Return to your accommodation for dinner and a relaxing evening.

Day 5:

• After breakfast, depart for Antananarivo.
• Stop at the town of Moramanga for lunch and a short visit.
• Continue the journey and arrive in Antananarivo in the late afternoon.
• Check-in at your hotel in the city.
• Spend the evening exploring the city and shopping for souvenirs.

Day 6:

• After breakfast, transfer to the airport for your flight back home.

Note: This itinerary is flexible and can be customized to fit your interests and preferences. Also, please note that the best time to visit Lake Alaotra is during the dry season, which runs from May to November.