A few weekends ago, Mike and I visited the Hall of Flame museum in Tempe/Phoenix (honestly, it's right there on the border so who knows?). He got a Groupon/Living Social/Amazon Local deal or something (these sort of things fall on deaf ears when it comes to me) and we went.
If you have kids, I definitely suggest it. It's very interactive -- you can sit in a truck, try on helmets, meet Smokey the Bear, slide down a pole, etc. And what kid doesn't want to pretend to be a fire fighter? At least for a little bit.
And some of the fire trucks were really neat to look at -- especially the ones that didn't look like fire trucks. Unfortunately, Mike and I just zoomed through. It's actually the biggest fire museum in America and it took us probably 30 minutes to walk around. We just have no ties to it. It was informative and educational, but not suited to my interests.