Late March is towards the end of the rainy season, so you should not expect high concentrations of game along the Chobe River. If you are really unlucky, elephants might even be a challenge to find. A lot depends on how good the rains have been so far this season.
Chobe is very close to Victoria Falls, and thus a convenient choice, but Zambezi National Park is even closer (it lies between the two, to get from the one to the other you drive right through it). It was on a game drive in the ZNP that I had the most elephant sightings ever. There were so many of them that I had a very hard time making it back to the gate by closing time. I was the only vehicle in the entire park, and the receptionist had already closed the office and was waiting for me with her handbag slung over her shoulders when I arrived at the very last second. This was in the 90s, I suspect the park is busier now.
Johan