Make your own way to the Mutianyu Great Wall (approximately 1.5 hour drive depending on traffic), and take a 5-minute shuttle bus (at your own cost) to the bottom of the mountain or go there walking to the from the Great Wall entrance. In order to get into the Great Wall, please show the provided voucher with the admission code at the Great Wall entrance for direct access (you will receive it within 20 hours after booking is made).
Then you can hike up the side of mountain to the Wall or take a cable car. Once on the Wall, you can walk over passing several watch towers for different views. On the way down, you can either walk or take the cable car (available for purchase upon booking).