Parc National d'Andringitra is the pièce de résistance of the wider Massif de l'Andringitra. It encompasses high-altitude plateaux of epic beauty, small tracts of primary rainforest, scenic trails along mountain streams and waterfalls and Pic Boby, the highest accessible mountain in Madagascar.
The best season to visit the national park is from June to November, when the rains aren't relentless (the park is officially closed from January to March, when heavy rains make access difficult). Afternoon mists are common in these high altitudes and you should be prepared for bad weather at any time of year. If you are climbing Pic Boby, you will need a flashlight with several hours of battery life.