I would choose the Spherical Earth Activity. I teach first class so I would aim to make this a very playful activity with lots of oral discussion.
The use of puppets would be effective here, as the children could interact with the puppet on north/south pole and ask it questions.
The puppet could bring in photographs of their home, they could map routes on the globe for how to visit the puppet.
Then I would introduce the toy ship/airplane to show them how to travel to north/south pole.
I would use the puppets to investigate the idea of ‘up/down’ with the children, rotating the globe as needed to explore how both puppets feel they are standing upright.
I would also bring in photographs of my own recent trip to New Zealand to explore how things look when you are on the other side of the globe.