My wife and I, aged 75, went to Kadizora Camp in the Delta and then to Ghoha Hills Savuti Lodge in Chobe National Park, as arranged by Sian Edwards of Off2Africa travel. The trip was pricy but worth it. Both stays were excellent - plenty of animals and scenery, explained in detail by qualified guides. We got not only to see animals, but understand how they lead their lives and the ecosystem within which they exist.
Though we saw only Maun, the airport city, to have an idea of the rest of Botswana, we came away with a very positive feeling about the country. The English of all we met was impeccable, and things worked well (with the exception of Air Botswana, which changed our flight time without notice). Off2Africa was very helpful in making our choices, which were good ones. If I had it to do over again, I would try to see a bit more of the water life of the Delta, which is fascinating.