I don't know that you would be disappointed with Lancaster but I agree that Ohio Amish Country is amazing. It has the largest Amish settlement in the country and it's beautiful. There is commercialism there too but that is any tourist area. I would just think to direct you there because coming from Texas it is closer for you. Scenic Hills RV Park is what you are asking for. It is labeled as a mature park. Kids are allowed but there is nothing to draw them there. It is in Berlin which is the heart of Ohio's Amish Country.