To get a birds eye view of the Mara and go Hot Air Ballooning, it is great fun.

The trip is magical: spend about one hour silently floating over the savannah in a hot air balloon and it will fill you with enough memories to last a lifetime. You take off in the wee hours of the morning, float in the sky, drifting with the whim of the wind, overlooking the plains, just in time to experience a breathtaking sunrise and catch a bird’s eye view of the reserve.

Expect to pay somewhere in the region of $550 per person.
NOTE: Take a hat to protect your head from the heat of the gas burners!