With 96 rooms, cottages, and bungalows, Sugar Beach, A Viceroy Resort in Soufriere, St. Lucia, offers a range of luxurious accommodations — and every single room has its own in-room plunge pool.

Deluxe and upper upscale hotel spas are looking for ways to raise the profile of the treatments they provide for the senior-level business traveler in need of rejuvenation. One solution is to house ...