Getting around Laguna is easy and free. There are free shuttle buses between all the hotels and the shopping centre as well as a ferry service around the lagoon to most of the hotels and the shopping centre. Leaving Laguna for other places in Phuket is expensive as few Phuket taxis travel to this complex. There are chauffeured cars available but these cost 600 baht each way to Patong or Phuket town.
Surin Beach is within walking distance if you're not in a hurry, just follow the road south of Bang Tao for about 15 min.