Arrive at the National Park entrance, pay the entrance fee, and embark on an invigorating trek. Immerse yourself in the vibrant tropical forest as you encounter an array of wildlife, including agile minks, curious squirrels, playful monkeys, colorful butterflies, and perhaps even the elusive yellow-headed langur, a rare primate listed in the Red Book. Conquer three mountains known locally as "Ang Vắt," "Mây Bầu," and "Ang Phay."After completing a 2.5-hour trek covering approximately 6 kilometers, reach the Frog Pond, the largest freshwater lake nestled amidst the National Forest. From the pond's depths, towering "Va Nuoc" trees reach skyward, a species unique to the Frog Pond and found nowhere else on Cat Ba Island. Observe the diverse fish and crab species inhabiting the pond, and take a well-deserved 30-minute break. Continue your trek from Frog Pond, ascending the final mountain named "Doc Dài" to reach Viet Hai village, a tranquil ancient settlement of approximately 100 families.