Four parks in seven days, run in an unusual order. You drop into the Ngorongoro Crater on the morning of day three and carry on to the Serengeti the same afternoon, which means you reach the crater fresh rather than at the end of a long week, and it frees up a full day on the plains afterwards.
The safari finishes at Tarangire, which plenty of people rate the most beautiful park in Tanzania for sheer density of game: ancient baobabs, and elephant herds working the river through the dry season. Drinking water, three meals a day on safari, all park entrance fees, accommodation in Arusha and the shuttle back to Nairobi are included.