Take this opportunity to teach Kindergarten kids. You could do it with the help of building blocks and helping them in the recognition of colours, shapes and objects.
Start them off on alphabets and numbers. As is with small children, they can imbibe inputs for a maximum of 30 – 40 minutes only at a stretch. This being their formative years, there should be scope for learning through fun and games which helps them concentrate. This could be challenging but we assure you, is extremely rewarding.