Need help thinking of a game?

We are running a small kids program that will start soon. We need a game that can motivate them throughout the year. Last year, we had a big custom monopoly board where the steps where changed by us to missions that fit the program. The kids earned points thought the year as they go through steps, then we had a points bazar at the end. We need sort of the same thing, collect points through a game, then have a points bazar. We want to change the game though and theres nothing in mind.