Our boatman, who guided us through several of the bay's caves

The wharf at Dau Go Island, in southwest Halong Bay

On Dau Go Island an 80-foot climb (via steps) leads from sea level to Thien Cung Grotto or 'Heavenly Cave,' considered one of the most beautiful caves in Halong Bay. Its picturesque stalactites and stalagmites would be fascinating enough without the garish lighting — which nonetheless does make for colorful photos!

A ray of natural light from outside the cave

Back at the wharf again