Packed with all the amenities—and unsightly development—of a modern Thai harbour town, Ao Nang is a popular base camp for exploring Krabi’s karst islands. A long arc of sand is shared by long-tailed boats delivering day-trippers to resorts and rowdy beach bars.

Phuket offers a rainbow spectrum of spectacular holiday sights from blue lagoons and pink sunsets to orange-robed monks. Three wheeled-Tuk Tuks, taxis, buses and long tailed boats transport visitors between these marvels. Phuket's south coast offers its most popular beaches. The north is more tranquil. Koh Phi Phi, Phang Nga Bay and Patong Beach are popular spots. Diving, snorkeling, wind surfing and sailing are just a few active options. Inland, forested hills, mountains and cliffs wait to be explored.

Bali is a living postcard, an Indonesian paradise that feels like a fantasy. Soak up the sun on a stretch of fine white sand, or commune with the tropical creatures as you dive along coral ridges or the colorful wreck of a WWII war ship. On shore, the lush jungle shelters stone temples and mischievous monkeys. The “artistic capital” of Ubud is the perfect place to see a cultural dance performance, take a batik or silver-smithing workshop, or invigorate your mind and body in a yoga class.

Byron Bay's beaches are dotted with lighthouses and surrounded by bottlenose dolphins, rays, whales and sea turtles. This former New South Wales whaling station turned tourist town is still strongly influenced by its recent bohemian past, when hippie lifestyles flourished. Bongos and didgeridoos sound in parks, sarongs and dreadlocks are common, and vegetarian restaurants abound. Give in to the casual vibe and stroll between beaches and bars for a low-key and happy day.

This former Bedouin fishing village is now a popular tourist destination—especially for serious windsurfers, who'll find some of the best conditions in the world off Dahab's beaches. Long known as a laid-back, backpacker-friendly town, Dahab is becoming more developed, yet retains a casual vibe. Finally, Dahab is also home to the Blue Hole, the world's most dangerous dive site. Only very experienced technical divers should attempt passage through "The Arch" here; if you're a novice diver, stay close to the surface. (Editor's note: Our list was compiled before political unrest prompted many countries to issue travel warnings for Egypt. If you're currently planning a trip to Egypt, please consider the risks and monitor your government's travel alerts.)