if I’m understanding you question correctly if you don’t have a FP prior to going to the park it really will depend on the time you are get on my Disney experience app when in the park my suggestion is once you were done with the first three fast passes is to book the Safari. Select a time that will allow you to then go on the trail (assuming one by Safari) before or after the Safari. It’s really your preference - walk first then sit or sit then walk. Depending on availability you may not have a choice.