On our last trip to Utah, we took an afternoon and headed over to the Discovery Science Museum in the Gateway. I totally recommend it if you live in Utah or are on a visit there. It had some really fun things for the girls, and it kept them entertained for quite awhile. It was a great activity for the girls and their cousins to do together.
A life-size helicopter, I imagine little boys would absolutely love this.
A cool xylophone, with sheet music to teach kids how to play a song. Not that Annie really understood that.
Annie and her cousin, Katelyn couldn't get enough of this water fountain the kids could play in.
They had a whole section on how food gets from the farm to the grocery store. Complete with dress-ups.