My wife will be taking my son to an event at Austin Children's Museum today. They are attending the Baby Bloomers program, which is only for kids 3 and under. It sounds like a neat place based on what she's told me, and as I was on their site earlier today, it looks like they have a cool event for older children as well.

It's called the Tinkerer's Workshop, and it's basically a scaled-down engineering style event that allows kids to build things out of provided materials. From their site:

Designed for children ages 5-11, activities in the Tinkerer's Workshop build creative problem solving and critical thinking skills through project-based learning and the engineering design process.

Go check it out!

More info on admission, hours, etc:

Hours
Tuesday - Saturday 10 am to 5 pm
Wednesday Nights - 5pm to 8pm, admission by donation
Sunday - Noon to 5pm, (4pm - 5pm FREE)

Admissions
Adults: $5.50
Children 2 yrs. old & older: $5.50
12-23 months: $3.50 | under 12 months FREE