FANTASTIC. I've been looking for something like this for a quite a while now. Hell I've been searching for someone like you for quite a while. First of all. GOOD JOB!! That's a great step you have taken. Now let's cut to the chase.
The app is very informative. Limited visual aids & very few visual aids. IT'S TOURISIM!! People cry for pictures of their friends and family visiting Tanzania. But you don't have that in ur app. Your app has alot of potential, i think you should hold off on releasing it and work on it for another 6 months atleast. Gather as much as information as you can. Travel to these places, take pictures.... LOTS OF PICTURES. I'm still testing it for battery usage and data optimization. So far (in 5 minutes) it looks good. Will let u know on that. Now the big thing is, yes you've said much about tourism in Tanzania but you wrote NOTHING about the country itself. Tell me something, before you go visit some place in a country, wouldn't you like to know about the country first itself? Write a little bio about Tanzania, who's who sorta thing. What currency do we use, what's the rate, cities, languages and sorts. What's the local time. Give the viewer all the info they need so they don't have to go to another app. I understand that requires time and resources. But you can do it! If you've come this far, the rest is water. Find yourself a team of 3 people to help you gather information. Use google's MATERIAL DESIGN codes for your app. Make it EYE CATCHING.
Best of luck, looking forward to your app in the play store but i hope u do it right.