My family will be staying in Kings Hotel for 4 days. What is the best and cheap itinerary?

Hi, as you will stay in HK for 4 days, I can suggest you a possible itinerary, hope it will be helpful.
You can visit Victoria Peak, Stanley Market and Ocean park in the first day in HK Island. At 8pm at night, you can see Symphony of Light show in the Harbor on the ferry.
Leave earlier the next day to Macau. There are ferry after midnight from Macau Marine Ferry Terminal to Hong Kong. So, you can have fun there for the whole day.
The third day, you can see Ngong Ping 360 in the morning, and then go to visit Disneyland in the afternoon. At evening, you can go to visit the Temple Street night bazaar.
The fourth day, you can go to visit ladies market and Wong Tai Sin Temple as they are both in Kowloon.