Tel Dan (aka Tel Afek) is an amazing nature reserve suitable for any age.
It was the northernmost city of the Kingdom of Israel. Upon entering it you walk through the nature on wooden paths, then you reach the ancient city of Dan with the greatly restored remains. Afterwards you walk on big stones through the riverbed and along the river where you can take a cooling bath.
Especially on warm days this park is recommended as most of it is in the shade.