Now, I haven't been to a lot of State Fairs, but the Arizona State Fair sure is good for people watching, if not for being very clean.
We put Kai on his first little roller coaster. While riding he looked equal parts terrified and exhilarated, but claimed "I liked it!" upon deboarding. The State Fair might not be your idea of fun (it definitely has its...quirks) but I enjoyed it. I love the sensory overload. The lights, the sounds, the smells (which are sometimes appetizing - fair food - and sometimes not - the agricultural center, for example).And then there's the food. Between us all we ate turkey legs, a huge corndog, a piece of pizza, gelato, soft serve, soda, water, beer and milk.
This is why I like the Fair at night:
We rode the big slide as a group. We even burned some of those turkey leg calories while climbing the steep grade to the top.
And we also rode the Ferris Wheel, which is a must for any Fair.
In summation, I'd say the Fair was a great time. It's pricey and a little crowded (with interesting people, such as the woman with the three week old infant - I asked), but a cool experience. However, I would suggest bringing your own hand sanitizer. Trying to locate some of that was like trying to locate Carmen Sandiego.