Here is a link to their website, all the information is listed here
http://www.kukookunuku.com/?id=42
According to their site, you first receive a champagne drink by the light house. You than receive your first drink free at each of the three bars on their tour and one at dinner.
Total drinks included seem to be five (5).
If you purchase their own insulated 16oz cup for $5.00 - the refills at the bars are only $5.00
Regards,