The Seychelles' unique marine biodiversity and appealing crystal-clear waters create the perfect conditions for underwater discovery. For snorkelling, head to one of the best sites of the Indian Ocean - Sainte Anne Marine National Park - or take advantage of the once-in-a-lifetime opportunity to swim alongside whale sharks on Mahe. Diving is another way to get close and personal with reef inhabitants (humphead parrotfish, octopus, various types of sharks - including hammerhead, if you're in luck). Seychelles Underwater Centre

Lying at the southern end of the Corniche, we find the Al Bidda district, the historical heart of Doha. Visitors can enjoy a wide range of fascinating sights and experiences, including the Museum of Islamic Art, Emiri Diwan, Dhow Harbour, Souq Waqif, Gold Souq, the spiral-shaped Al Fanar Islamic Centre and Al Koot Fort. This area boasts another concentration of hotels. Well known international and regional brands include Crowne Plaza, Mercure, Al Bustan, Century, Oryx Rotana, Concorde, Souq Waqif Boutique Hotels and Marriott.

While there's plenty to so in Charlotte Amalie on land, it would be a great loss not to explore the underwater wonders of the U.S. Virgin Islands. The easiest thing to do is rent a snorkel and explore the shallow waters by the beach, but you should definitely consider trying something more advanced at least once. Snorkelling is the cheapest choice. Add some diving equipment to go deeper and see more. Some tours now offer Sea Trek helmets — a modern take on the diving helmet. No matter your choice of equipment, do explore the coral reefs that are home to tropical fish such as snapper, hamlets, parrot fish, sturgeon, squirrel fish and majestic sea turtles.