It's fascinating to explore Vietnam's nature, and there are numerous ways to do so. One option is to embark on a cruise from Hanoi, which takes you through the bay, allowing you to visit different islands along the way. Another great option is to venture to Ninh Binh province, known for its stunning beaches and lush mountains. Here, you can discover the Trang An Caves and enjoy a serene boat ride along the river. Ba Be National Park in Bac Kan Province is also worth visiting, with its captivating attractions like Laos Cao caves, Dau Dang waterfalls, and Puong Cave. The park offers a range of activities such as hiking, swimming, and kayaking. For those in Hanoi, Ba Vi National Park is a fantastic choice, offering a diverse range of plant and animal species. You can partake in activities like hiking, camping, bird watching, and fishing. Cat Tien National Park in Dong Nain province is renowned for its rich flora and fauna, and visitors can enjoy hiking, biking, bird watching, and canoeing. Lastly, Cat Ba National Park in Hai Phong province is a vast area waiting to be explored, with its breathtaking natural beauty.