For adventure-seeking types who want something more on their trip to Alaska, whitewater rafting down the Nenana River through Healy Canyon is a good option. This river flows out of the Nenana Glacier and offers Class III and IV rapids in a stretch known as Canyon Run. The voyage offers scenic mountain views and, typically, fast currents with medium to large waves (that all depends on recent rainfall and snow melt). You can choose to either paddle or go along for the ride on an 18- or 21-kilometer (11- or 13-mile) run. Outfitters provide dry suits, but it’s best to wear warm layers and a hat, and remember to bring an extra pair of socks and a waterproof camera. And be prepared: Even with a dry suit, your face and hair will get drenched as you ride the rapids.