This is the most up to date list that is available at the moment, it's from September 2006:
-Horticulture Activity 9:00am Every Wednesday Arusha Rock
-Flamingo Activity Everyday 9:30am Flamingo Pond *Bead Activity
-Animal Tracking 11:00-1:30pm Everyday Arusha Rock * Bead Activity
-Arts and Crafts with Lifeguards 12:00pm Every Day Uzima Pool Deck
-Medallion Rubbing 12:30pm Everyday Lobby
-Cooking Decorating 1:00pm Everyday BOMA
-Garden Safari 2:00pm-4:30pm Everyday Flamingo Pond *Bead Activity
-Spirit of Africa Art Tour 2:30pm Everyday Ogun's Firepit
-African Games or Crafts 3:00pm Everyday Uzima Pool Deck
-Culinary Tour of Africa 4:00pm Monday, Tuesday, Wednesday, Thursday. 3:45pm Friday, Saturday, and Sunday Jiko Podium.
-Family Fun and Games 4:00pm and 6:00pm Everyday Contact Lifeguard for location
-Music of the Savannah 5:00pm Everyday Sunset Lounge *Bead Activity
-Wildlife Games 6:30pm Everydat Sunset Lounge *Bead Activity
-African Folktales 7:30pm Everyday Arusha Rock Firepit
-Primal Parade 7:50pm Everyday Zawadi Marketplace
-Cultural Safari 8:30pm Everyday Sunset Lounge
-Animal Viewing with Nightvision 9:00pm-11:00pm Uzima Savannah Overlook
Start times might vary, so you should check on the board in the lobby. Especially the story telling at the fire pit depends on when dusk is, so it changes around quit a bit.
I personally have only been on the Culinary tour which I can absolutely recommend, you get to taste some of the food at Boma, it would be a great introduction for anyone who is at Boma for the first time. Just make sure you go on the day you will be dining at Boma as the buffet offers different things on the other days.