Silversea focuses on luxury cruising, which is exactly what you’ll find on the Silver Spirit. The 540-passenger ship is the line’s largest, but it’s still much smaller than most ships sailing the ocean right now. All cabins have deep tubs in marble bathrooms, continuously refreshed minibars, and soft sheets and duvets. White-gloved butlers are at your service, and elegant eateries include the jazz-themed Stars Supper Club.