What activities should i include in a campaign for kids?

Hi everyone. I work for an NGO and we are going to organize campaigns all over the Delhi NCR region for kids between 6 - 11. Now its mostly about "gift a plant" and spread the gift of greenery....a green campaign basically...so i wanted to ask you guys what do u think would be the ideal kind of activities that we cud organize for the kids to teach them and hold their attention as well....please do help....