Things to Do in Southeast Asia in December

December is likely the finest month to experience Hanoi from the back of a motorbike. The city's usual wall of humidity tends to lift, and what replaces it is a crispness you can feel on your face as you weave through the Old Quarter's thirty-six guild streets, each one still named for the trade it has carried for centuries, Hang Bac for silver, Hang Gai for silk, Hang Ma for paper votives strung across the lane in red and gold. The smell of pho broth simmering in street-front kitchens mingles with charcoal smoke from bun cha grills, and Hoan Kiem Lake sits under a haze of morning mist that burns off slowly as the city wakes around it. Morning departures catch the tempo shift, monks at Tran Quoc Pagoda, tai chi groups arranging themselves on the lake shore, the rhythmic clang of copper being hammered in Hang Dong. The cooler air turns what would otherwise be an overwhelming sensory onslaught into something you can settle into and absorb at motorbike pace.

The Similans sit roughly 70 km (43 miles) off Thailand's Andaman coast. December tends to bring some of the season's clearest water after the islands reopen from their five-month monsoon closure. The boat ride from Khao Lak takes about an hour and a half through open water. The thrum of the engines and the salt spray on your face build anticipation before the islands appear as dark shapes on the horizon. The first thing that hits you when you drop off the dive boat is the shock of blue. A visibility that seems to stretch beyond what your mask should allow. The only sound is your own breathing through the regulator. Granite boulders the size of houses rest on white sand at depths of 15-25 m (50-80 ft). They are draped in soft coral that sways with the current. Manta rays tend to frequent the cleaning stations around Koh Bon. The deeper pinnacles at Richelieu Rock are where whale shark sightings cluster in the early season. Even snorkelers staying near the surface get extraordinary reef access. The shallow coral gardens around Island Four are some of the healthiest in the Andaman Sea.

December's dry conditions transform the Angkor Archaeological Park. A wet-season visit simply cannot replicate this. The laterite paths between temples firm up instead of dissolving into red mud. The moat around Angkor Wat reflects an unbroken sky rather than monsoon grey. The sandstone carvings across the Bayon's 216 serene faces seem to glow in the low-angled morning light. Cycling the smaller circuit puts you at a pace where you notice details. The loop is roughly 17 km (10.5 miles) from Angkor Wat through the Bayon, Ta Prohm, and back. You hear the sound of cicadas in the strangler figs. You feel the cool of entering a stone gallery that still holds the night's chill. You catch the sweet burnt-caramel scent of palm sugar being boiled at a roadside stall. The real trick is skipping Angkor Wat at sunrise entirely for your first morning. Start at Pre Rup or Banteay Kdei instead. You might have an entire temple to yourself for the first hour after dawn. The crowd mills around the main reflecting pool.

Luang Prabang in December moves at a tempo that the rest of Southeast Asia has mostly forgotten. The morning alms ceremony along Sakkaline Road starts before the sun clears the mountains. Hundreds of saffron-robed monks walk barefoot in single file. Residents kneel with offerings of sticky rice. The only sounds are footsteps on pavement and the soft thud of rice dropping into brass bowls. The air carries woodsmoke and frangipani. The whole scene develops against a backdrop of French-colonial shophouses and gold-tipped temple roofs catching the first horizontal light. By mid-morning, the Mekong runs low enough to reveal sandbars and rocky outcrops. Monsoon hides these for months. This makes the slow-boat trips upstream to Pak Ou Caves a different visual experience. The twin limestone grottoes are packed with thousands of small Buddha statues left by pilgrims over centuries. No other time of year looks like this. The night market along Sisavangvong Road fills by dusk with indigo-dyed textiles. Hmong silver feels cool and heavy in your hand.

Singapore's hawker centres operate on a different logic than restaurant dining anywhere else in Southeast Asia. These are open-air complexes where individual stalls serve single dishes perfected over decades. Some families have operated their stalls for three generations. December adds the festive layer of Orchard Road's light canopy overhead. Cooler evening air makes the walk between centres less of an endurance test than in the sweltering months. At Maxwell Food Centre in Chinatown, the clatter of steel woks meets the sharp sizzle of char kway teow. Flat rice noodles are tossed in dark soy and lard over volcanic heat until the edges crisp and caramelise. The air fills with a smoky sweetness that clings to your shirt. Old Airport Road Food Centre is a favourite among residents for its sheer density of quality stalls. It serves carrot cake, a pan-fried radish cake, not the Western dessert. The blackened crust is so crisp it shatters on contact. The walk from Chinatown through Telok Ayer to Kampong Glam threads you past incense clouds from Thian Hock Keng temple. You also catch the musky-sweet scent of oud drifting from the Arab Quarter's perfume shops.

Southern Vietnam's dry season runs strong by December. Saigon's evenings settle into warm stillness. Riding pillion on a scooter through Districts 1, 3, and 4 feels like the only way to eat dinner. The city shows itself differently at speed and after dark. Neon signs reflect off wet pavement in freshly hosed alleys. A thousand motorbikes roar, then fade. The intimate clatter of a single banh xeo griddle takes over. Caramelised pork drifts from clay-pot rice stalls. Exhaust competes with jasmine from nearby parks. District 4 sits across the bridge from the tourist spine. This is where grittier street food lives. Bowls of bun mam arrive under fluorescent strip lights. Fermented fish noodle soup carries funky depth. It hooks you instantly. Or it takes a second serving. Plastic tables wobble on the pavement. The banh mi stands near Tan Dinh Market in District 3 use wood-fired ovens. The ovens date to the French-colonial era. The crust shatters loudly. The person next to you looks up.