By the way if you plan to visit Phu Quoc Island, bring a flash light. it will be very useful to walk along Long Beach after the sun sets. I do not know why, but even during the full moon, nights were very dark.
The sun sets around six o'clock. Usually you will take a shower afterwards, and go to one of the restaurants on the beach to have dinner. Some restaurants put torches on the sand, and light bonfires. How romantic ...