[Caroian]

As in, an agent to book with, or the best location?

If the latter, any of the big safari locations are likely to be amazing. The only areas I have experience of are the Lake Naivasha area in Kenya plus the Masai Mara in Kenya and Serengeti in Tanzania (they adjoin). We saw the start of the wildebeest migration and it was awesome. The Governors' camps in the Mara remain highly recommended and we certainly enjoyed our stay. We combined it with time on the coast near Mombassa, but Zanzibar is another popular combination.

Lots of choices of who to book with - a lot will depend on you budget.