About 23km northeast of Dāndōng is a small dock where you can board a speedboat (seats eight) for a thrilling, wet 30-minute ride up the Yālù River. Close to shore, the driver will take you close to a portion of river where you are between two DPRK banks – the mainland on the left and a DPRK military-occupied island on the right.
Sidle up to waiting DPRK boatmen to buy local smokes, currency and alcohol (though it's cheaper in China!) before zipping back to shore. You can flag passing taxis at Tiger Mountain Great Wall (3km away) to ride up to the dock for ¥5. Alternatively, get a Dāndōng taxi to take you here directly for about ¥35.