32 hours in Bahrain – any advice?

I visited Bahrain for a few days some decades ago. I occupied my time by getting a rental car (the taxis system was irritating) and visiting the Observation Tower at the middle point of the causeway (just before the border), the oil well museum (which turned out to be closed) and an old mudwalled fort (which also turned out to be closed but I snuck in anyway). I don’t recall much else, but maybe it has changed?

We stayed at the HGI in Bahrain Bay last year. It’s very modern, does a good breakfast and is attached to a big mall by lift which has lots of food and shopping options. The best hotel is the 4 seasons which is on the other side of the bay (5 mins by shuttle boat) and where we will be heading back to when we return for October half-term