Thurston Bay Marine Park is located on the northwest side of Sonora Island in the Johnstone Strait. The park provides sheltered anchorage and recreational opportunities for boaters traveling the popular Inside Passage. Thurston Bay Marine Park has two separate portions. One section is bordering and taking up part of Thurston Bay and the other bordering Cameleon Harbour.
Access to the park is by boat only. There are no developed facilities at the park, although random camping is allowed. Visitors can go swimming, fishing, hiking or paddling, or explore the small, pretty beaches dotting the rocky shoreline. An unmaintained trail leads to Florence Lake, ideal for peaceful swimming, fishing and paddling.