You’re on a gorgeous island off the coast of Thailand—it doesn’t get much better than this. Spend the day on a lively, popular beach, or explore the Ang Thong National Marine Park’s secluded lagoons. Looking for romance? Choose a luxurious five-star resort, a simple, secluded bungalow or pretty much anything in between.

Vietnam's bustling largest city sets the cultural and economic pace for the country. The former Saigon boasts charming French colonial architecture and wide boulevards, usually thronged and choked with traffic. Taxis are an option for seeing the sprawling city. The War Remnants Museum shows the Vietnam War through Vietnamese eyes. Don't miss the impressive Jade Emperor Pagoda. Go to the frenetic Ben Thanh Market for food, flowers or frogs. Tour through the Mekong Delta, past rice paddies and houseboats.

This city on the central Vietnamese coast is a well-preserved example of the important Southeast Asian trading port it was from the 15th-19th centuries. Already a common stop for backpackers, it is becoming better known to tourists. On the 14th day of each lunar month, the town trades its electric lights for traditional coloured lanterns. Sights include the Japanese Covered Bridge and the Quan Cong Temple. Let the town’s expert tailors make you some bespoke clothing.

The charming Vietnamese capital has aged well, preserving the Old Quarter, monuments and colonial architecture, while making room for modern developments alongside. Hanoi may have shrugged off several former names, including Thang Long, or "ascending dragon", but it hasn't forgotten its past, as sites such as Ho Chi Minh's Mausoleum and Hoa Lo Prison attest. Lakes, parks, shady boulevards and more than 600 temples and pagodas add to the appeal of this city, which is easily explored by taxi.

Colombo is the gateway to Sri Lanka for most travelers—but don’t be tempted to simply pass through this diverse and interesting city. Take a train ride along the coast to Mount Lavinia, a popular beach, or explore the Talangama Wetland, which several TripAdvisor travelers say is the perfect place to take a break from the bustling streets of the city.