A great example of a visual schedule for older kids. The picture by each activity helps younger kids understand it to! You can make your schedule changeable by using Velcro to attach each of the activities and moving them around as needed.
Tree idea for Reading Area, tent... Options: attach some of the branches to the ceiling /or drape thin blue cloth for sky/night sky. Add white Christmas lights to the "sky" i.e. on the hanging fabric or wall ceiling.