Things to Do in Kota Kinabalu in May

Five islands sit just offshore from Kota Kinabalu, and May's calmer, clearer water makes the reefs around Manukan, Sapi, and Mamutik the obvious draw. You can be snorkelling over clownfish and staghorn coral within 20 minutes of leaving Jesselton Point. The water is warm enough to stay in for hours, the morning light turns the shallows turquoise, and because it's shoulder season the beaches aren't shoulder-to-shoulder the way they get mid-year. Go early.

At 4,095 m (13,435 ft), Mount Kinabalu is Southeast Asia's most accessible high peak, and May's cooler, relatively drier conditions make the two-day summit climb less punishing than the wet months. Even if you skip the summit, the montane trails through Kinabalu Park reward you with pitcher plants, wild orchids, and air that feels cool against your skin after the coastal humidity. The cloud forest smells of damp moss and leaf litter, and the temperature can drop toward 50°F (10°C) near the rest huts overnight.

Tucked into rainforest about 25 km (15.5 miles) from the city, Mari Mari recreates the longhouses of Sabah's main indigenous groups, and visiting in May means you arrive primed for Kaamatan, the Kadazan-Dusun harvest festival. You'll smell bamboo cooking over open fire, taste tapai rice wine, and feel the floorboards of a Rungus longhouse flex underfoot during the dance demonstrations. It's the clearest, most hands-on way to understand the culture you'll see celebrated city-wide at the end of the month.

About 80 km (50 miles) north of the city off Kota Belud, Mantanani is the white-sand, clear-water escape that day-trippers picture when they imagine Borneo. May's settled seas make the roughly 45-minute speedboat crossing far smoother than in the windier months, and the snorkelling here ranges from reef fish to the occasional sea turtle gliding through the shallows. The sand is fine and pale, the water bathwater-warm, and the island stays quieter than the closer marine park. Bring cash.

Roughly two hours south of Kota Kinabalu, the Klias River winds through mangrove and nipah palm where proboscis monkeys, found only on Borneo, crash through the canopy at dusk. May evenings are ideal: the rains have greened the wetland, the heat eases as the boat drifts upriver, and after dark thousands of fireflies blanket the riverside trees like a slow electrical storm. You'll hear the slap of the water, smell the brackish mangrove mud, and feel the cool river air replace the daytime mugginess. Bring insect repellent.

Kota Kinabalu's sunsets are the nightly headline, and Tanjung Aru beach, a short ride southwest of the centre, is where locals gather to watch the sun slide into the South China Sea. May's fickle skies help here, with broken cloud catching fire in copper and pink. Grilled corn and satay drift from the stalls, kids splash in warm shallows, and casuarina trees hiss in the evening breeze. It's free and ranks among the best free things to do in the city.