We've rounded up the best cruise lines for couples, along with our top recommendations on where to sail for a romantic getaway. SeabournCourtesy of Seabourn Cruise LineAll Seabourn ships carry fewer than 600 passengers—making this small luxury cruise line an especially great pick for those seeking a romantic experience. Uniworld Boutique River CruisesCourtesy of Uniworld Boutique River CruisesThanks to their small size, elegant ships, and ever-changing surroundings, river cruises are nothing short of romantic—and Uniworld Boutique River Cruises are especially suited to couples. While the cruise line allows kids on board, grown-ups seeking solitude can head straight to the adults-only Solarium, a tranquil pool area ideal for relaxation. Where to cruise: With its pristine beaches, volcanic landscapes, and lush rain forests, Hawaii offers a spectacular backdrop for a couple's cruise.