Here's a map of where Texas Hill Country is, and an example of what it looks like:
Stanley decided to take a drive through a part of the Hill Country known as the Devil's Backbone. This is section straight north of San Antonio, with a pretty loop to drive between the towns of Blanco and Wimberly. It is a very historic area, with spots to stop and read about Texas and even some ghost stories!
Along the way Stanley stopped off at the Fischer Store. Fischer is a very small town originally settled in the 1850's as a trading post for settlers in the area. It's a popular spot to stretch your legs along this drive.