After breakfast, visit by boat to Luon Cave, a ring-shaped pool inside an island in Halong with absolutely tranquil landscape and emerald water. Back to the Wharf of Halong passing the most densely area with many islands that have been named like the Cock-Fighting Rock, Sail Island, Incense burner rock or Sea Dog Rock. Early lunch/brunch will be served on board. Arrive at Halong Wharf around 11.00. Return to Hanoi around 4PM and drop off at your hotel for check in. Free at your own leisure. Overnight in Hanoi.