The Jordan Valley is full of historical sites: the shores of the Sea of Galilee, Caparnaum, Mount Tabor, Mount of Beatitudes... If you want a bit of nature then diving in the Dead Sea or hiking in the Judean Desert await you.
For those who are there in the context of a religious stay, such intensity! I had the chance to meet believers of many religions and talk with them about faith and politics, a very strong human experience. There are also many kibbutz along this fertile valley transformed by agricultural work of Jewish settlements.
And in the Jordan, would you like to re-enact the baptism of Jesus? This is a rather muddy little river, whose banks were built up in some places... the miracles are of those who do not get sick after bathing in it!