Hi Janice,
It is becoming increasingly difficult to book a Robben Island excursion on arrival in Capetown, so I suggest that you try and book in advance.
The booking line number is: 00 27 21 413 4200
Or e-mail them on:ebookings@robben-island.org.za
Or take a look at the website, which is: www.robben-island.org.za
This excursion will cost approx R150 (150 South African Rand) which converts to about £9.50.
I hope this helps! Let me know how you get on.
Best wishes,
Cheryl, your editor