The Old Quarter of Hanoi is a charming and vibrant neighborhood that is perfect for exploring on a rainy afternoon. With its narrow streets, colonial architecture, and bustling markets, the Old Quarter offers a unique glimpse into the city's past. Take a leisurely stroll through the streets, browse the shops selling traditional crafts and souvenirs, and sample the delicious street food that Hanoi is famous for. Don't forget to visit the iconic Hoan Kiem Lake, located in the heart of the Old Quarter, and admire the beautiful Ngoc Son Temple situated on a small island in the lake.