Friday is the holy day; weekends are Friday and Saturday.
Don’t bother trying to buy a map of the island; there are none detailed enough for driving directions. Ask for directions instead.
Bargaining is expected when shopping in the Souq.
If you are in Bahrain during Ashoora and want to see a procession, women must be in abaya and hijab and stay in the women and children’s section. Allegedly if you are caught taking photos, men will come up and confiscate your camera.