Hi should I apply for a hong kong visa if I'm going just for 4 days there?

I know that it is 14 days allowed without viza, and 90 for new zealanders. In my case I'm Russian (as shown in the passport) who is studying in new Zealand (I have 2years student viza), BUT i have kazahstan passport. So, do I have any benefits or may be I can do my viza on the entries in hong kong?

Thank you for your help.