Yes it's Phang Nga Bay, but the island specifically in the picture is, Koh Ta-pu ('Nail Island') or James Bond Island because it was in "The Man with the Golden Gun".
my wallet:
4Cd7rzeiqwQJe8dCZbQeQxeNHUV4P4w7hAJ2g8U2ciiEao2AmqN9tXEfngQaPGV6T2Sx9mEtCaEMzaCR53iQRJqEgkVmHVnYVwTDxNoV6B