Greetings It's usual to greet people when walking into an office or small shop: a simple 'good morning/afternoon/evening' will help promote good feeling.
Queues Though queues are rigidly adhered to in banks and the like, customers in shops or bars often just bark out an order as they arrive, even if others are already waiting. Be assertive but polite.
Clothing Keep beachwear for the beach, and cover up when ordering drinks or food from beach bars. Always dress respectfully in temples and churches, covering shoulders and avoiding shorts. It's illegal to drive without a top on. Camouflage clothing is also illegal, and will be confiscated on arrival to the islands if found.