Some “free stuff” at AKL is the free Boma and Jiko restaurant tour daily at 4:00. You get some free samples, usually soup and a zebra dome at Boma, and bread service samples at Jiko.
Another free thing to do at AKL is to go out to the edge of the Savanah and see the animals. The guides out there can answer your questions about the animals and even loan you night vision goggles after dark.
It’s also a nice free activity just to spend time visiting the lobby with all the unique and authentic African art work. The gift shops have many items not found in other gift shops on property. AKA is well worth a visit!