The Boise River at Barber Park has always been nice to me in June. No Guide needed. Also along the hwy that runs up to Idaho City(Hwy 21). Idaho City is a great old mining town too. If you go over the top on 21, you reach the Salmon river where it is small, and that is nice too.

Definitely go to the Old penitentiary in Boise as well, especially if any of you like old guns..they have the greatest old collection...