Kenya. Travel advisory
I just saw the first forum post about concern for the current travel advisory for Kenya. Before everyone on this tour starts panicking, read the BBC NEWS website where it clearly shows a map of the areas where the UK are pulling out tourists. It's mainly the Mombassa coast and borders with Somalia and the Eastleigh area of Nairobi. The US has posted a travel advisory but are not evacuating US citizens. The 'Safari Areas' are not affected by the travel advisories.
Tauck will be watching things carefully and obviously have their customers and staff as top priority for their safety. I also know that Tauck have a plane charter on 24 hour/365 day standby that they can bring in to evacuate their customers if ever there is an incident in any of the areas they have tours.
The tour is only in Nairobi for a half day, staying in a hotel before people are bussed to the airport. I assume the airport will have extra security.
For people who are traveling to Nairobi before the tour begins in Arusha, I personally would stay in the overnight hotel and not wonder anywhere apart from heading back to the airport for my flight.