I'll come right out and say that Okapuka needs to be on your list of places to see when you come visit Namibia.
Okapuka is between Windhoek and Okahandja, so you can easily make this a day trip from either city if you don't want to stay in the lodges on site. We arrived at 10am and had a two hour guided tour through the safari with a quick picnic included. Our guide was extremely knowledgeable on each animal, and made sure we were able to see everything-including two white rhinos!
The park sits on 10,000 hectares and is home to crocodiles, mountain and plains zebras, a large variety of antelope including sables, springbok, and oryx, plenty of giraffes, ostriches, and five white rhinos. You can expect to see everything in your tour!
Because of how close the park is to the airport, I would plan on booking a game drive in your first day or so before heading out to your next site.
Here's the link to book your game drive! https://gondwana-collection.com/accommodation/okapuka-safari-lodge
Love it! How does it compare to other parks you've been to?