1. Hong Kong Island: Hong Kong University (free, take the subway to Sheung Wan, which is very close, and there is Sun Yat-sen Memorial Hall nearby), Madame Tussauds Wax Museum (on Taiping Mountain, which is a little far, you can take a cable car, with more than 300 tickets. If there are maps and advertisements of the wax museum, you can save 20 yuan by cutting them out. ) These two scenic spots will take a day!
2. Kowloon: Hong Kong Science Museum (Tickets are probably from 30 yuan, so I suggest you go to a nearby history museum! It only takes half a day, but there is no direct subway, so you can only take the subway to "Jordan", hehe, it's Tsim Sha Tsui, get out of Gate D, and then take the bus. Some of them go directly to the Science and Technology Museum, but I can't remember the car number! )
If you live on Lantau Island, you can take the subway to the nearby Disney. The air ticket is about 400 Hong Kong dollars (1 day).
4. It is best to have a night tour in Victoria Harbour (at night, or take the subway directly to Tsim Sha Tsui East Station, hehe, you can go to the Avenue of Stars, where the fingerprints of the stars are printed, and then take a boat to the Star Ferry Pier).
I hope it helps you!