Not at all Thai, but Guildhall in Glencoe is our pre-Ravinia go to when it's too cold or wet to picnic. They're able to turn tables pretty quickly early in the evening, and have some great salad and starter options that make for a nice light supper. If you time it right, you can even leave your car there and hop on Metra to go right to the park from there.
Doesn't sound exactly like what you're looking for, but I'm not sure what you have in mind exists.
"There’s only one thing I hate more than lying: skim milk, which is water that’s lying about being milk."
- Ron Swanson