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The best time to visit Hanoi is from November to March, when temperatures are mild, ranging from 14°C to 26°C, and rainfall is lower. November and December are especially pleasant, with the fewest rain days. Avoid May to September, the hottest and rainiest stretch, with frequent downpours and high humidity. April and October offer a balance, though they are warmer and slightly wetter.

Stay in the Old Quarter for first-timers; it's walkable and close to the sights. The French Quarter (Hoan Kiem District) offers a quieter, more upscale stay near Hoan Kiem Lake. Tay Ho (West Lake) suits those wanting more space and lakeside calm. Ba Dinh is convenient for the Ho Chi Minh Mausoleum and government area.

Start with the Hanoi Old Quarter: narrow streets, street food, and everyday life. Thang Long Water Puppet Theatre is a unique traditional show not to miss. The Temple of Literature is a peaceful, historic Confucian site. Hoa Lo Prison Relic tells a powerful story of colonial history. Ho Chi Minh's Mausoleum and the nearby Imperial Citadel of Thang Long are key for Vietnam's modern and ancient past.

Day trips from Hanoi go to Ninh Binh, with Tam Coc boat rides, the ancient capital Hoa Lu, Trang An and Mua Cave, for limestone scenery. Ha Long Bay cruises cover the bay and Lan Ha Bay with kayaking, cave visits and islands. Both are full-day excursions worth an extra day. A city tour stays in Hanoi itself.

Three days covers Hanoi's core sights: a day for the Old Quarter, Ngoc Son Temple, and Thang Long Water Puppet Theatre, a second for Ho Chi Minh's Mausoleum, the Imperial Citadel, and the Temple of Literature, and a third for Hoa Lo Prison and the museums. Add a fourth day if you want a day trip to Ninh Binh or Ha Long Bay.