The world's most romantic cruises for Valentine's Day - from Tahiti to Italy

If you're looking for ways to keep your relationship afloat this Valentine's Day, put down a deposit on a cruise for two. Just be sure to choose a ship and destination that enhance the mood for romance.

Princess Cruises has been a top choice for couples since The Love Boat was set on its fleet in the 1970s, and more recently, The Real Love Boat dating show, which was shot in Australia aboard Regal Princess.

To create a more indulgent experience on the line's big ships, book a Sanctuary Collection suite on Sun Princess or Star Princess. This upgraded accommodation grants access to the Sanctuary Club, with a secluded pool, cabanas, bar and wellness classes, and the exclusive Sanctuary Restaurant.

Among the perfectly paired, two-country itineraries are France and Italy, Greece and Italy, or the Greek Islands and Turkey. All-inclusive packages include unlimited drinks and specialty dining, and reserved seating at theatre productions.

Reality show lovers may be interested in Windstar Cruises' Star Breeze, which was one of the settings in The Golden Bachelorette, filmed last year in Tahiti. Guests on this romantic yacht can request special touches such as a private dinner under the stars or a rose petal bed turndown.

Do it in honeymoon style by starting your trip with a few nights in an overwater bungalow. Windstar's partners include the Sofitel Kia Ora Moorea, Hilton Conrad Bora Bora Nui and Intercontinental Bora Bora Resort & Thalasso Spa.

Adults-only lines Viking Cruises and Virgin Voyages are the safest bet for avoiding children or crowds. Azamara, Regent Seven Seas Cruises, Seabourn, Silversea and Cunard are also ideal for couples, with elegant venues and very few kids.

Gay couples seeking to get married can consider Celebrity Cruises, which performs legal same-sex weddings.

For a local departure, Celebrity Edge's South Pacific cruises are round-trip from Sydney to Fiji and Vanuatu, while Celebrity Solstice sails one-way from Sydney to Hawaii. On the top deck is the one-of-a-kind Lawn Club, where you can have a picnic on real grass.

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Most cruise lines allow married couples to renew their vows at sea, with ceremonies led by the captain or cruise director. Customised packages include private meals or small parties with canapes, champagne, music, roses, matching boutonnieres and professional photography.

Luxury lines and bigger ships also have gift services and engagement packages, so you can send flowers, wine or chocolates to your cabin anytime.

How big: 156 suites, 312 guests