Save up to 65% off rates on stays throughout 2024, with the strongest discounts in the Summer and Fall. (Holidays and Spring stays are each marked at least 55% off). Plus, if you stay for 7-nights, you’ll receive up to $1,200 in inclusions. The couples-only All-Inclusive Serenity at Coconut Bay Saint Lucia has an Expedia rating of 96% based on 64 reviews.