I also want to go around Beijing, eat snacks (there is no cheaper restaurant) and visit cheaper places.
The zoo is in Xizhimen in the city, and the safari park is in Badaling, which are far apart. On the first day, you can go to the city first, go around the places you want to go, and check the road map online in advance. On the last day, I lived in the city, set off early in the morning, went to Badaling Wildlife Park and returned to Datong in the afternoon. There are many restaurants for you to live near the Art Museum, which is close to Long Fu Temple and Wangfujing. There are so many places to go in Beijing that you can't wander around every precise destination. I can't finish it in a month. If you just want to go to the safari park, Datong will leave early and return the same day after playing.