We have visited all three of the listed tels in Israel, plus many more besides. These three all share the fact that the sites were first settled around 5000 years ago, and have experienced multiple layers of occupation since then; in the case of Hazor and Megiddo, around 20 layers, and Beersheeba about 9 layers.
Tel Hazor is the most northerly, located near Rosh Pinnah. Buses heading north towards Kiryat Shmona and Metulla can drop you at the access road, but do not get confused with Hazor kibbutz which is several kms south. It is a hot, dry and dusty site most of the time, but there are a number of excavations opened up. To find some shade at the site, you can descend into the water works chamber. There is an interesting museum a short distance away.
Har Megiddo (Mount Megiddo or Armageddon) overlooks the Jezreel Valley, and is best accessed by buses travelling between Haifa and Afula. We have been here several times and continue to find it fascinating. Of particular interest are the sunken grain silo, the huge water cistern, and the tunnel (which you can walk through in the shade) which leads to a spring outside the defensive wall. An important occupier was King Solomon, abouth three thousand years ago, who had most of the structures built that can be seen today. The most recent occupiers were the British forces during the First World War.
Tel Beersheeba, is about 5km away from the modern city of Beersheva, and is accessible by local bus. It is a large site comprising ruined streets and houses surrounded by a defensive wall, and showing sophisticated water and drainage systems. The site was occupied by the Ottoman army during the First World War, but they were defeated by ANZAC (Australia and New Zealand Army Corps) horsemen in 1917.