Langkawi in 3 days: the 99-island Andaman archipelago where 550-million-year-old limestone karst rises from turquoise sea, where Brahminy Kites swoop for fish tossed from boats in the mangrove river, where a curved pedestrian bridge hangs at 700m above the rainforest canopy, and where the duty-free alcohol is the only thing cheaper than the sunsets.