Paula
When I did a Kenya safari, the clothes in the day were very practical, no bright colours as it attracts the insects etc.
Smart casual clothes and layers are what I always take. Also a back pack came in very handy.
Make sure you have hand cleansing gel, wet wipes, tissues, on tours like this I take dioralyte or similar to replace salts etc, anti histamine, mossy spray With at least 50% Deet, upset tummy stuff, and general first aid bits and pieces.
When I visited Kenya I went to a Children's orphanage for children suffering from AIDS, so I took pencils, crayons and colouring books etc.
I am sure you will have a great time..
Cindy