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Asia Outdoors. Based on Cat Ba Island, this adventure company specializes in rock climbing, kayaking, and hiking tours. Noble House Mezzanine, No. 222, 14 St., Group 19, Ward 4, Cat Hai District Hai Phong City, Cat Ba Island, Halong Bay. 031/368–8450. www.asiaoutdoors.com.vn.
Blue Swimmer Sailing. Sailing, biking, and kayaking tours are available through this Cat Ba-based tour operator. It also offers overnight eco-junks that are geared more toward budget-conscious travelers. Ben Beo Pier, Cat Ba Island, Halong Bay. 84–31/368–8237. www.blueswimmersailing.com.