Do I have to make a reservation for the night tour as well as the day tour for Simatai?

Hey, Marcia. Yes, it is necessary to book in advance. For your convenience, you are advised to book the tour in advance. If you wanna a reliable travel agency, TravelChinaGuide.com is a recommended choice. My friends joined their Simatai Great Wall Tour Package last year and they had a good opinion on this company. If interested, their contact information is traveltravelchinaguide.com.