I also drove and walked by the prime minister's office, but didn't go in.
The Zoological Natural History Museum
I didn't go, but someone else told me this was pretty depressing.
I also walked by this nice cathedral, but didn't have enough birr to enter.
National Museum of Ethiopia (የኢትዮጵያ ብሔራዊ ሙዚየም)
A good museum with the Lucy skeleton, but it could be much better.