Hi Shufih,
You'll come to the right place for film photography. There are tons of camera and film stores here. Depends on your budget really. But here are some of my picks
For Cameras:
Most are in Tsim Sha Tsui and are walking distance to one another.
There are three stores in Champagne Court in Tsim Sha Tsui called David Chan Co., All Good Friend Camera, and All Best Camera that have some serious stock. The prices may be on the high side, depending on what you aim to get, but quality is usually guaranteed. But they ahve some affordable stuff as well.
Just off Nathan Road also in Tsim Sha Tsui, there is a building called tsim Sha Tsui mansion where Shogun and Matsuya cameras are located. Matsuya may look like a small shop, but I've bought most of my vintage cameras from them. Their stock may not be as large as some of the stores in Champagne Court, but they seem to always have the right stuff. Shogun specializes in rarer cameras, so they may be our of your price range, even mine.
Another cool store in Tsim Sha Tsui is Zhao Xiang Guan located in Kimberly House in Tsim Sha Tsui. These guys cater to professionals, so they have some serious stock as well. A couple of affordable stuff here too.
Last I would recommend is HKCamera, also in Tsim Sha Tsui. They just moved to this new location and I love coming here because the cameras are all free for you to play with. Some expensive one, but most are affordable cameras for the enthusiast looking to dip their feet into film photography. I would go here if you want to pick up something on the cheap. Some film selection here as well.
For Film:
Places I go to are:
Chung Pui Photo Supplies on Stanley Street in Central. I like to buy from them to support the little guys. They are also quite easily accessible from the MTR.
Image Playground also in Central. Some selection here and fairly central location.
Dot Well Photo in Champagne Court, TST: Where I get my film developed, so sometimes I pick up a couple of rolls from here. More selection that the previous two I find.
Of course, there are many photo-related stores that sell cameras and film, but given your time limit, I think these are good given that that they're clustered in certain areas.
Hope that helps. Happy shooting.