Cat Ba Island is, in my opinion, the highlight of Ha Long Bay. The island has one smallish port town with numerous hotels, hostels, bars, markets, and restaurants. I suggest spending at least two days on the island in order to really see what it has hidden. Staying in town is a fantastic base, where you can rest and relax, but also rent a motorbike or scooter to explore the inland areas of the island. The main town area houses some fantastic markets where a traveler can pick up a large amount of pearl based jewelry for a very small cost. You can also find numerous floating restaurants throughout the harbor serving fantastic food. Inland on the island, the first real item of note is a small hidden stairway just off of the main road, leading to a cave. Inside the cave, you will find a secret medical facility built beneath the earth during the Vietnam War. When I happened to visit, the cave was completely empty, so I was the only person there making it an extremely creepy experience. The atmosphere inside of the facility is haunting, especially knowing that numerous people died within its walls from their sustained wounds. The complete silence and dim lighting add even further to the already creepy atmosphere. I definitely suggest checking it out even if you find it a little unsettling. The next and probably main attraction on the island for me is Cat Ba National Park which you can find in the center of the island. Whether or not I took the correct route is unclear, but for me to get there I had to park my bike and walk through an abandoned village, whose only inhabitants were wild dogs and deer. This setting was also somewhat creepy, but after visiting the hospital cave, not so much. The hike to Ngu Lam Peak, an excellent observation point located in the park should not take more than an hour or so each way. The view from the peak was fantastic and looked over the landscape in every direction, showing nothing but jungle covered peaks for the most part. My only piece of advice would be to cover your body head to toe in insect repellant and to make sure that you are taking malaria tablets because mosquitos will eat you alive on this hike, more so than any other hike I have ever been on. Apart from the inland attractions, make sure to explore the town’s markets and bars for a very enjoyable experience. Also, make sure to try horse show crab and mantis shrimp if you have a chance, both are delicious. Cat Ba makes for a fantastic few days if you have the time.