Replying to LENS ADVICE

I am going to Africa this summer and plan to record literally everything to make an edit. I have the Panasonic g7 which has a micro four thirds mount with the 14-42 kit lens and I plan to buy another lens to take on the trip, but have no idea which lens would benefit me the most on this trip and when I come home. I'm not sure if I should get a long zoom lens or a short, fast cinematic lens. I am super interested in film so will need this to be a lens I use all the time. All I need is some suggestions on which PANASONIC lens I should get thank you.