Boiling Lake 
Difficulty: Strenuous  
Next to Ti-Tou Gorge, The Boiling Lake Hike ranks as one of Dominica 's most demanding trails, with good reason-three hours to the lake and three hours back over some challenging terrain.  This well-maintained trail begins at approximately 1,600 ft, where a level stretch of rocky pathway blends alternately with wooden steps.  But don't be fooled by the flat beginning-it grows steeper. Although this is a strenuous trail, the trip is among the best ways to experience the rainforest of the Caribbean's Nature Island. See and hear rainforest birds and other rare tropical animals while truly experiencing the heart of the island.  Do not attempt this difficult trail without a local guide. 

Morne Diablotin
Difficulty: Strenuous
Dominica's most challenging excursion is the steep hike up to the peak of Morne Diablotin (Devil's Mountain), in the Northern Forest Reserve.  The Morne Diablotin trek is rarely conquered, so take it on, and rank yourself in the very smallest percentage of Dominican explorers! Towering to 4,747 feet, the island's highest peak is also the natural habitat of the two endemic parrots found in Dominica: the jaco and the sisserou.  Be sure to start your hike early in order to reach the peak by midday, allowing more time for bird watching. But don't worry if you miss one of the rare parrots, you're sure to spot many of the other 170 species of birds in Dominica .  Though the distance of Morne Diablotin is shorter than that of Boiling Lake, it is more vertical, rougher and virtually untouched near the top.  This natural, rugged hike rises quickly to a steep hill and eventually you'll be hauling yourself up the wooden steps by holding on to roots and vines. This hike is very difficult and will take one full day; do not attempt this difficult trail without a local guide.