The Thinkery is Austin's Children's Museum. Family memberships are $95 for a family of four, and includes free entry for a year. Members only hours are a perk, the first Sunday of every month, from 8:30 to 10, when it opens to the general public. Admission is $9 if you're not a member (kids under 2 free). It is very difficult for a large group of preschoolers to stick together here, so feel free to just do your own thing and say hi when you see someone you know.