How to get to Causeway Bay from victoria peak, HK?

First of all, you can take the cable car and come back to Central Station. Then take Island Line, get off at Causeway Bay Station, Exit E. It takes around 15 mins on the way. The ticket fare is 5.2 HKD per person.
After getting out of the subway station, you can easily find many shopping malls, such as Fashion Walk, Golden Plaza and Island Beverley. Just enjoy your shopping journey!