Had the opportunity to paddle down the Tatshenshini & Alsek Rivers last summer and recently released a video on the experience:
This is one of the classic Alaskan/Yukon river trips, and the beauty was unimaginable. Think countless glaciers around you, bald eagles & grizzlies everywhere, and a spectacular bush plane flight out amongst knife-edged peaks. I tried to capture some of this beauty in the video & hope it inspires you!
You can read more about the trip and see pictures on my site too: Exploring the Tatshenshini & Alsek Rivers