Also, Dont forget that if you stay for park close and are IN LINE you'll get to ride before closing for any attraction that you are in the queue for (IE Flight of Passage) so if the park closes at 7 and you get in line at 6:58 you'll usually get on that ride within 30 min and be out and on your way. We used this strategy to hit FOP and Navi River a few years back. We timed getting off FOP with just enough time to get in the queue for River.
Used to drive safaris for 2 yrs. It all depends on the Temperature. If it is a warmer morning, the animals will be out and moving. If it is cold out, (30's- low 60's) safaris are usually pretty barren because the animals get to choose if they want to go out on safari and they usually choose to stay in their warm barns until it warms up more outside. 60's you'll start to more consistently see Rhinos, Elephants, Lions, Giraffes, more of the bigger animals.
The 70 degree safaris were usually some of the best. 80 Degrees and above can be good for Pictures because the animals don't move around as much, they tend to stay still
My favorite safaris to drive were always during summer rainstorms or right after the rain. Usually its cool and the animals are extremely active. Elephants love to swim in the rain. Some of my favorite memories of working there was watching the baby elephants playing in the water. There were no other trucks behind us so we watched for a few minutes before someone else came along and we continued.