We will stay causebay hotel on 17/10-20/10, pls advise for transport,nightlife & itinerary

Well, the nearby transportation of the hotel is very convenient, both for the bus and subway - Island Line.
Meanwhile, you can go around to enjoy yourself for the nightlife. or you can go to Tsim Sha Tsui to have a nice nightlife.
Where do you want to visit? Then I can give you a decent itinerary. Anyway, Disneyland, Ocean Park and Victoria Peak cannot be missed.