Is there a chance that you take a few days 2 to 3 days and spend it together at the falls.
schedule an evening dinner river cruse, helicopter flight over the falls, tribal village and then do the game drive at the nearby park. that is doable in 3 days and you will not be rushed. do the river curse on your first day and do it again if you really like it.
Then find an PH to take you for plains game and find one that has a great camp. Some are way better than others. Ask if they have a second vehicle to do game drives for your partner. this is always a hit. you go one way hunting and she goes a different direction for viewing.
Then ask if she would like to go on a proper tracking for some animal on you list.
you do not want to leave her on her own, for safety concerns.