@LevAryehBoy- the Banyas was no trickle of water when I was there.. you just need to go after a rainy season for it to be worth anything. Although it is pretty reminiscent of Bushkill Falls here in the US of A.
@everyone else- As a Chol Hamoed outing though, I would be wary. There seems to be some unwritten halacha somewhere stating that it is absoloutely necessary to go on a hike near water on Chol Hamoed in Israel. so unless you enjoy crowds….you should probably stay away from the Banyas.
And any beach will be teeming with seminary girls.