My favourite option if I were an Iranian general?
Attack the Saudi oil installation at Ras Tanura, 100 miles across the Persian Gulf from Bushehr. Forty percent of the world's seaborne oil passes through this port daily. Launch everything you have against that, turn those fat naked storage tanks and pipelines into burning wrecks, and suddenly oil goes to three hundred dollars a barrel overnight and now the whole world is involved in a total clusterfuck.
Every Western nation's economy will crash fast now that spice flow is hindered. Everyone will be drawn in. And since Iran also happens to be sitting on the 4th largest oil deposit on earth, their oil is going to get valuable fast. The Iranians can spam mines into the Persian Gulf just to make sure no tanker can go about its lumbering business. There will be nothing the US Navy or Israelis can do about any of this unless they can track ten thousand speedboats. Obviously the Saudis will be highly pissed but other than some bombing runs there's nothing they can do to realistically damage the Iranians.