So you will only take the tour to Great wall, here are some Beijing One-Day Tours(https://www.travelchinaguide.com/package/beijing-one-day-tours.htm) that includ visit to the Great Wall. But if you also want to visit some other places in Beijng, Beijng Tours(https://www.travelchinaguide.com/package/beijing.htm) offer more choices. Good luck with your upcoming travel to China:)