First off, buy an octopus card for HK$100 so you can take the train or the tram (big bus). The first in the list is the Big Buddha. You can reach it via the cable car in Tung Chung (that's also the name of the train station). Next is the 10,000 Buddha in Sha Tin. Again, take the train. That's good for one day. And for leisure, you may want a day tour Disneyland and another day tour to Ocean Park. And if you still have time, try going to The Peak for a wonderful scenery. There are more places but what I had enumerated above are the 5-stars in my list.