If you can get it online it is best because not all hotels have this on hand. If not then at the Waterfront Boat company which I believe is key 5 underneath the big mall is where you will buy it. When they asks you what time to activate make sure that you say 9am-10am.
To use the hop on hop off bus you will have to go the office near the aquarium give them the card and then they will give you the ticket.http://www.thecapetownpass.com/


