I plan to be driving East on I-70 in mid-May and would like to stop off for breakfast and to visit the Gateway Arch with my family (kids ages 2 & 5). We will be driving straight from Denver so will have been in the car for about 12 hours. Probably arriving in Saint Louis around 7:30 am - will we hit bad rush-hour traffic? Also, any recommendations for a place to grab a yummy breakfast from where we'd park at the Arch? Thanks!!