About HK$130. I went there at Nov 2004. You can book at shops on Patong beach. The transport from Patong to Sunset cliff is about 45 mins. I went there first from Patong to Phuket Town for 30 mins(shopping) then to Promvthep Cape(dinner) and return hotel. You can book a tuk tuk for the trip. Remeber to bargain the totall price before go. Also, pay when the trip is finished. The whole trip for 8 hour should be about $130 but depends on high or low season. The following Web site should have more update info. www.thailandfans.com.
I also checked the name of the restauant at patong for you: Savoey Seafood.