NoWorNever, here is the amended plan from Day 16.
Day 16 - Take Air Asia flight from Kuala Lumpur to Hong Kong. Clear Immigration and customs. You will be amazed to see how beautiful Hong Kong airport is. Among top 3 in the world. After Exit, you will find currency exchange on right side. Change US$ 100 only. You should use two ways to reach city. Either Airport Express Train (takes 23 minutes) or a Bus (takes 1 hour). HK Airport Express is more advanced than those in Thai and Malaysia. Follow the signs. I recommend Bus because it offers nice views. You can use train on return but still I recommend Bus. Airport express train costs HK$180 return trip. Bus costs HK$33 each way. Hong Kong buses are double deck and latest, air-conditioned, clean and comfortable. Sit on upper deck in front row if available so you can see views from windscreen. Bus will reach Nathan Road. It is a long stretch of road, more than 5 km having several MTR (underground train) stations and thousands of shops and buildings. It is the Kowloon area. Get off at MIRADOR MANSIONS Bus Stop. Tell the driver. It is next to Holiday Inn Golden Mile Hotel. There are many buildings so don't get confused. Touts will come to you offering rooms. DO NOT listen to them. Enter Mirador Mansions, you will see many shop on the Ground floor. Take Lift and reach Floor 16, Flat B3. VINCENT GUEST HOUSE. Ask for MISS APPLE. She is a very nice Chinese lady. Get a room with double bed. for HK$ 150 to 180 (approx. Rs. 1600 ~ 2000 per night). Ask her for window room. Rooms are small because it is Hong Kong, but with attached bath and shower. Please note hotels in Hong Kong are very very expensive. Cheapest you will find is US$100 per night, so Vincent Guest House is much better. The lifts operate 24 hours, so no worries. Mirador Mansions has their own security staff. Have lunch or dinner. You can find all kinds of fast food chains on every corner of HK, Halal food is also available nearby. After some rest, go out walking towards STAR FERRY. It is about 10 minute walk from Mirador Mansions. You will pass many 5 star hotels like Peninsula, etc and shopping centres. Next to Star Ferry is a sitting area for tourists. Go there, You will have breath taking views of Sky scrapers on Hong Kong Island across the channel. There is a must watch lighting show on buildings at 8 PM. You will also see cruise ships at the Star Cruises pier. There is also a big shopping centre besides sea. Nice cafes and restaurants inside. You get view of Yachts passing by. Come back to hotel walking and window shopping various shops as it will be night time.
Day 17 - Go to Star Ferry and take ferry to Central Pier. Use the walkway to Bus stop. Take bus to Ocean Park (Aberdeen), ride the cabin car which crosses peaks. Enjoy sea world show and numerous other rides. Come back using escalators, it is one of longest outside escalator in the world. Just like coming down from Peer Sohawa to Blue Area. Then take bus and go to Stanley Bay and Repluse Bay beaches. In the evening come back to Central and see hundred of branded and non-branded shops. Its a paradise. Take Mid Levels Escalator, longest escalator in the world. it reaches different streets on the hill and each street has shops, cafes, bars, etc. Take Star Ferry back to hotel.
Day 18 - Go to Star Ferry and take ferry to Central Pier. Take bus to THE PEAK TRAM. Purchase tickets and sit in the TRAM. It will take you to top of Hong Kong Island. All Sky scrapers you will feel tilting. Because it is very steep. Like going to Peer Sohawa straight up on TRAM. Breath taking views of Harbor, Kowloon and HK Island. Many cafes, fast food chains and shopping up there. Enjoy and then come back to Hotel.
Day 19 - Go to MTR Train Station besides Mirador Mansion at 9 AM. It is called "TSIM TSA TSUI" station. It is 2 minutes walk from your room. Take train to Central MTR Station. Now take train to DISNEY LAND.. Enjoy there. One or two station after Disney Land station, there is a station where you take CABLE CAR and go to BIG BUDDHA mountain. Do it if you have time. The cable car in long goes over Water. Enjoy and then come back to Hotel.
Day 20 - Go to MTR Train Station besides Mirador Mansion and take train to MONG KOK station. in evening. Now visit NIGHT MARKET, it is flea market. When shops close, the whole street is taken by vendor stalls. Besides night market many many shops also. Shoes, clothng, computers, jewellery, bags, food, etc etc.
Day 21 - Take Air Asia flight from Hong Kong to Bangkok. The Airport BUS can be taken just outside Mirador Mansion on Nathan Road. You can see the sign.
Day 22 - Spend in Bangkok enjoying.
Day 23 - Take Thai Airways flight back to Islamabad.
Hong Kong standard is higher than Thailand and Malaysia. And the beauty and shopping is outclass.