Tam Coc - Bich Dong, often referred to as "Halong Bay on land", is a stunning natural area known for its serene rice paddies, limestone karsts, and cave systems accessible by small boats. The boat tours, primarily rowed by local women, take visitors through the Ngo Dong River, passing through three main caves (Tam Coc) and offer breathtaking views of the surrounding landscape. Bich Dong Pagoda, a series of cave temples built into the mountainside, is another highlight. Accessibility can be challenging, especially for those with mobility issues, as it involves steps and getting in and out of small boats. Solo visits are possible, but the boat tours are a shared experience. The best time to visit is during the rice harvesting season (May-June), when the fields are a vibrant green or golden yellow. Expect to spend around 3-5 hours exploring the area, including the boat tour and Bich Dong Pagoda. The cost is moderate, including entrance fees, boat tour tickets, and optional tips for the boat rower.