Clyde,A couple of thoughts - internet access and/or television.
I assume you are close enough to your house to access the home wireless internet. But if not and you are burying things, add ethernet cable. Same for installing whatever is needed so you can use a television in the garage, just in case.
Already have a pipe in the ground into the building that was put in when the power pipe for the panel was put in before the concrete was poured so I can run network cable and coax inside.