One can drive from Nairobi (Aprox 6 hrs) or take a bush plane to get you to one of the Airstrips in the Mara. It is important to identify the strip close to the camp you will be staying in as drive distances in the grasslands can be quite long.
Make sure you have a tripod and bean bags(incase you can't get down from the vehicle.
The Mara has the most beautiful sunsets I have seen. They are clear and the grass lands with the occasional tree gives it simplicity.