Regent Seven Seas Splendor and Explorer cruise ships have the most luxurious spas at sea and they just launched a new globally-inspired Serene Spa & Wellness, featuring restorative treatments integrating techniques and ingredients from the 450 destinations they sail to around the world. There’s no better way to relax during a day at sea — so book your spa days sooner than later. For example, the Around The World massage includes Caribbean-inspired coconut poultices, Chinese bamboo, and Swedish massage techniques. A deep sea heat mask uses Baltic bladderwrack seaweed to detoxify and ease tension, while Regent’s signature manicure and pedicure use South Pacific frangipani.