#1. Bovec
Soca Valley's de facto capital, Bovec offers plenty for adventure-sports enthusiasts.
With the Julian Alps above, the Soca River below and Triglav National Park all around, you could spend a week here rafting, hiking, kayaking, mountain biking and, in winter, skiing, without ever doing the same thing twice. It's beautiful country and Bovec's a pleasant town in which to base yourself for these activities.