After big prayer events in temple, we are given half a coconut, banana and a flower as a parting gift. What do I do with these?
These are called Prasādam. These are of religious importance. These are given to devotees as a blessing from God. Take them to home and eat them. You can also distribute among your friends and family. But don't waste them. Flowers are to be kept in hair. They are also considered auspicious.
Related question : Why do we people offer Prasad?