Guests at Rosalie Bay Resort on the Caribbean island of Dominica can save 40 percent on stays of two nights or more at the wind- and solar-powered eco-boutique resort now through Sept. 15, during peak sea turtle nesting season. Under night skies, guests can watch the giant creatures amble ashore to nest, or hatchlings head out to sea.Three types of endangered sea turtles, the green, hawksbill and giant leatherback, travel thousands of miles each year to nest on the protected black sand beach of Rosalie Bay Resort. Guests may participate in the resort’s sea turtle conservation program by helping patrol the beach to protect nesting turtles, aiding researchers in collecting data or relocating nests that are too close to the ocean to the turtle hatchery, and being “on call” for when baby sea turtles emerge from their nest. With the discount, daily rates begin at $150 per couple plus tax and service charge. Daily rates include continental breakfast, free Wi-Fi, yoga classes and guided nature hikes near the eco-resort. Stays of five nights or more also include complimentary roundtrip airport transfers. The offer is available in all categories of the resort’s cottage-style accommodations with hand-carved hardwood four-poster beds, spa bathrooms with walk-in rain showers and private balconies or patios with views of the gardens, Atlantic Ocean or Rosalie River.