To access to this island, one has to take the ferry from Kaohsiung harbour (very cheap) and once there, you can decide whether to rent a bike, walk or get someone to ride the bike to take you around.
The best time to visit is around the weekend and in the afternoon so you can take the day to cycle around and enjoy a bit of the beach. In the evenings, you can go to the night markets to try loads of local delicacies. Definitely tried the sticky tofu (is not too bad once you past the smell), stew food, dried seafoods, seafood restaurants and the tomato with the local flavoured sauce to go with it. I am not sure if the BBQ corns are still around but it is definitely worthwhile to try as it tastes very different and so much yummier than the ones that we have overseas. Highly recommended.
Also go to the temple on the island that is very close to the ferry terminal, it is the oldest temple I believe in Kaohsiung that is over 300 years old. The locals believes no pictures should be taken when you are in the house of Gods so please do respect the rules and have a look at the local belief that makes an island special. It is the outer island of Kaohsiung that protects the main parts of Kaohsiung so you can also climb up to the higher part of the mountain follow the trials and that will allow you to see the panoramic views of the island the some part of the port. Very highly recommended if you want to experience a bit of the local culture, this is certainly a place to go. ^_^
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.