Near the Clock Tower, take the Star Ferry across the harbour to Hong Kong Island's Central district. This is a $2 Hong Kong ride worth taking multiple times, in the day time and specially at night. On the island side, you land close to the 3rd. tallest building in the world, number 2 IFC. From the harbour, walk to the black Statue Square and cross the street to the HSBC building to see the loin from the Hong Kong HSBC $100 bill.
Next, take the tram up to The Peak to over look the entire Hong Kong Harbour, a spectular view!
After returning to Central, take the MRT to Wan Chai, an English expat area for food and drink. The Old China Hand, my favorite British pub is 104 Lochart Road. Next to it is the Thai Farmer which has hot and spicy authentic Thai food; not cheap but excellent Thai food. Further down Lochart is the Bottoms Up bar from the 1974 James Bond film The Man with the Golden Gun.
Wan Chai has a fun night life. The main area is on Lochart and Jaffe, between O'Brien and Fenwick. A Filipino dance bar is the Laguna Club, upstairs, corner of Lard and Jaffe. Along Jaffe has a couple bars with bands. For an expience, go downstairs into the Neptune bar. At night, they may have a Filipino band playing which is entertaining. More entertaining is all the ladies, mostly Filipina, some Thai and Indonesian, all looking for a good time. Also, on the streets, there are a number of Ladyboys walking around in the evening. All in all, it is safe interesting place a night. I suggest going there between the hours of 10:00pm and 1:30am. Stay out of the places with curtains and women trying to get you to in, these are expensive and not worth it.
A half day trip to the Big Buddha in the Po Lin Monastery is well worth it. Take the train, on the Tung Chung Line, to the Tung Chung Station. It is short walk to get on the cable car. Take the ride up the mountain and walk around the new tourist area, the monastery, and up the steps to the Big Buddha. In the monastery there is vegetarian food available. The tourist area food is expensive.
Go to the Temple Street Night Market for Chinese and other cultural items. To get there, go to the Yau Ma Tei MRT stop, exit "C" and walk west 2 blocks. Suggested hours: 8:00pm to 10:30pm.
In Central, Hollywood Road has good stores with Chinese cultural products that are new or historic. Go to Staunton Street in the Soho district for European and other foods of the world. The prices here are reasonable, and the food amazing. Near here is the worlds longest outdoor escalator which goes up and down the hill side. The bottom is close to Central MRT station. The Soho district, is on the way up.
For a place to walk and shop, go to the Mong Kok MRT stop, exit E2 to find stores and a street market. This is a busy fun place to go for bargains, stylish reasonable priced clothes, and people watching. For indoor air conditioning shopping and restaurants, walk over to the Langham Place mall which is close. It has one of the longest indoor escalators in the world.