Embark on a day trip from Hanoi to Cat Ba Island, where you can soak up the serenity of Lan Ha Bay. On this adventure, you’ll cruise through towering limestone formations, an extension of Ha Long Bay, where you swim in clear waters and kayak into hidden lagoons. Many tours also visit Cat Ba National Park for biking in Viet Hai Village or explorations of the historic Hospital Cave. You may also find itineraries that stop at Monkey Island for hiking and beach time, though most all excursions include a fresh seafood lunch and round-trip transfers, for logistical ease.