You don't come to Bahrain for a holiday. You end up here because you've got business to do, have a layover or visit someone. General opinion is there's nothing here to see but a couple of malls. Unfortunately people leave the island without having seen some unique artifacts, some of which can only be found in Bahrain. The Honeycomb graves are one example. Then there are the Burial Mounds of A'Ali, thousands of them, Babar Temple, the Royal Tombs in Janabyjah, Saar Settlement Excarvation with an interesting temple and Tel Q'alat (Bahrain Fort, Dilmun Cities).
Quick Tips:
Bahrain is a small place so all major sites could be visited in a day, if you're pressed for time. You need a good guide to find the sites. Try to arrange this at the National Museum, a good starting point anyway for a quick overview.Best Way To Get Around:
There is no reliable public transportation in Bahrain and caps are expensive, plus most taxi drivers rely on you to know where to go! Best way to find your way around would be to get a car from the hotel you're staying in and arrange for a fixed price.