Two months ago I went to HK to attend my cousin's wedding. The date is after my final exam, so it was a perfect time to celebrate
And for you who like me ;) who need a prepaid sim card with data plan, you can buy it at 1010 store at the airport. From what I read, one2free seems like a good deal. I plan to buy the 5 days pass (HKD 88) but at the end I used other sim card because my uncle had already bought it.
And if you plan to use a lot of MTR or bus, you can also buy octopus card at the airport. Just buy the standard octopus card for HKD 150 (deposit HKD 50, stored value HKD 100), and at the end of your trip you can exchange your card to get your deposit and the remaining value back.
Get to the city? How? I think the easiest way is to use a cab. But you can also use Airport Express, for single journey to/from airport: