My kids had a chicken fingers meal & a hamburger meal at Nascar (Citywalk). Both were good and they were happy. I don't remember how much the meals cost, but it was reasonable.
It's been my experience that most restaurants at Citywalk and at the Portofino (with exception of prob Emerils and Delphio's (sp?) at the Portofino offer kids menus. Most restaurants consider kids to be kids until the age of 12.
Hope this helps some.