From the 46,000-plus square feet of Italian marble to the largest suite at sea (with its $200,000 Hästens bed and private spa), the 750-passenger Regent Seven Seas Splendor is a luxury lover's paradise. What's more, the newest ship from Regent Seven Seas Cruises, which is known for its all-inclusive perks, is sure to wow. Here are the top onboard luxury experiences.