When are you going? It is really hot there in the afternoon, that is the last place I'd want to be after traveling all day. Also in the summer, you get those pm storms. We just got back from a 10 day trip, and never got rained on, so you just don't know. Rained in MK, we were at AK etc.
after 2 the crowds really thin out. You don't want to miss Festival of the Lion King, the Safari, a bugs life.
The bird show, Countdown to extinction, and take the time to really look around.
If you are going in cooler weather, that would be great.
AK closes the earliest, so you could go to Boma's for sure after the park closes. will you have a car or be doing the bus? It isn't close enough to walk to , but about short bus ride.
We love Boma's, go once each trip. But it is a different taste.
Also depends on where you are staying, it's a little bit of travel out to AK,
depending on how every one feels, you may want to do DTD or pool, and plan a big character dinner or nice dinner out that night , and get going early the next am.
Really depends on how long you will be there, where you are staying, who's in the group...ages, when you are going etc. But if you don't mind the heat and humidity and possible rain, you can do AK in the afternoon, go to Bomas after it closes.
You may not get to do everything, but you could hit the high spots