Sea Kayaking · Quảng Ninh ProvinceSea kayaking, Ha Long Bay limestone karstsADVANCEDRisk: MODERATEVND Full-day guided trip ~1…Paddling between thousands of jungle-topped limestone karst towers rising straight out of the Gulf of Tonkin — routes weave through sea caves and hidden lagoons only accessible by kayak at specific tide levels, some requiring a near-horizontal duck under the rock to enter.View details