Whilst in Namibia on my last visit, I travelled for a couple of days in the Etosha area. Being in the park itself is quite different to being on a private reserve, since there is no off-road driving allowed, but there was still a lot of great game viewing when driving around the park.
We were fortunate to come across a group of 3 young lion brothers, likely ejected from their pride within the past few months, as they had gotten to the age where they needed to be on their own. They still had the energy and playfulness of cubs though, chasing each other around a water hole. We were even more fortunate to be the only vehicle to being viewing these lions for the majority of the time that we spent with them, allowing us to get in a great position to watch them going about their day.