@OBNurseNH they sell drums in the gift shop at AKL - african / bongo type style - and they are irresistible to a young boy.
Over your stay your kids can participate in different cultural activities and earn beads - they are pretty cool, small plastic and shaped liked their activity, such as drums, giraffes, etc. You collect them on a lanyard.
Sounds like you are doing big touring but if you were around the resort at all during the day get a guide and it will tell you where "bead" activities are taking place. Maybe on your resort day?
DS10 likes to sit out on the balcony and play his drum - it's cute. And then he brings it to the drum session in the lobby (I think it's around 5:30pm in Jambo).