Good Sam campground address

I learned a valuable lesson last week......I used the address of a campground from the GS campground guide to input into my GPS, oops we ended up at a fence with a locked gate looking at a power dam. I was able to get back to the highway where I got a cell signal and I called the campground and they said oh no that is our mailing address. Here is our physical address....Lesson learned ......verify first before heading out.....once before we went to a campground that was in one town but the mailing address was in another town....