If you're planning to visit Nairobi, I just stumbled upon a great article that you should check out: The Top 10 Best Places to Visit in Nairobi, Kenya. It covers all the must-see spots, from the Nairobi National Park where you can see wildlife right next to the city, to the David Sheldrick Wildlife Trust with adorable baby elephants. There's also the Giraffe Centre where you can feed giraffes and the Karen Blixen Museum for a bit of history.
It's a really helpful guide to make the most of your trip. Enjoy your travels!