If you had no barriers or constraints, what would you use GIS for?

Would you use for forest mapping, agricultural field boundary assessment, mapping street furniture or utilities, supporting charity work through provision of mapping services?

Would you go more wild, and aim to map every single tree in the world, combined with smart tags and growth models? Maybe travel to mars to be the first to provide a GIS dataset? Or what about mapping all the cave networks in the world?

If you could use GIS for anything, what would it be?