The rafting in Jinja Uganda was awesome even though I thought I was going to drown at the Bad Place, the training and safety precautions were excellent. Not sure if it is true that your life flashes past you shortly before you die !
The Gorillas in Rwanda were an unforgetable experience. I recommend putting your camera down and just watching them for a while. I was kicked by a gorilla on my thigh, his name translates to Lucky. This was because I was blocking his path back to the main group and in no way did he try to hurt me. The porters were great, they pulled a few of the members in our party up and down the mountain !
Camping in one of the parks was an unforgetable experience. Shining a torch on the surrounding bush in the middle of the night refelected back from wild animals eyes. Not sure what type of animals these were !
Take plenty of spare camera batteries and charger (forgot to take a charger !). There is always a queue for charging batteries on the bus and access to plugs is spasmodic. Next trip I will invest in an SLR, taking decent pictures of wildlife is difficult without one. Dont't forget a water flask.
There is quite a bit of traveling on very poor roads so it is a tiring trip, be prepared to have a numb bum !
Dont take the mother in law on this trip, I think she thought Lizzie and I were trying to polish her off. In the rafting pictures she looked terified.
We went in November so the weather was very pleasant. I can imagine at certain times of the year it would be excessively hot and would make traveling uncomfortable.