You can do some window-shopping at Avondale Shopping Centre during your stay in Harare. While you're in the area, wander around the gardens.
You can search for that perfect souvenir at Sam Levy's Village during your stay in Harare. While you're in the area, wander around the gardens.
After visiting U.S. Embassy in Zimbabwe, make a plan to see the other sights and activities in Harare. While you're in the area, wander around the gardens.