From Chalkboards To Strollers: Autumn Scavenger Hunt For Toddlers and Pre-Schoolers - This is great for just paying attention to the world around you! And I think with older kids you could make it a race!
Get kids to collect some Autumn leaves and glue them on to an orange paper plate (or you could paint it orange). The poem in the middle reads: Autumn leaves are falling down. Red, yellow, green and brown!