Right in the heart of the city, Hoàn Kiếm Lake is a little slice of peace away from the buzz. You'll love a gentle stroll around its banks, especially in the early morning when locals are practicing Tai Chi. Make sure to cross the iconic, bright red Huc Bridge to visit the temple on the island – it's a classic view. On weekend evenings, the surrounding streets are closed to traffic, and the whole area comes alive in a completely different, festive way.