If you are looking forward to visiting some hidden gems in Hong Kong, then the Sea Cave is an attraction you must not miss. Located by the High island Reservoir, this place receives very few visitors but is a very fascinating point of interest to visit in Hong Kong. A well-built boardwalk allows you to conveniently walk nearer to the Sea Cave and observe it from a close distance. While the Sea Cave makes for an interesting sight to behold, the surrounding hills with lush greenery along with the reservoir water also leave you mesmerized.