Oh geez, what a nightmare. OK, well, forget the Exploratorium. If you haven't taken the kids to Fairyland yet, do, it's a sweet place for the little ones, and small and easy to go on your own.
I know what you mean about trying to plan family outings, and somehow our A's turn it sour. It's happier and easier to just go without them. For years, I almost regarded myself as a single mother because I wound up doing so much without my AH. He would go along and just take the fun out of things.
So maybe a sweater or tie would be in order, and then you can be done with it. ;-) So sorry you have to go through this when you should feel supported and loved as you are raising babies.