I need some ideas for this, "What would you do if you could live forever?"

travel everywhere in the world and become a rich millionaire and do everything there is to do in life.

Sit on the same bus for as long as I could, and with each ride, get up and choose a new person to sit next to. Talk to them. Ask them questions they wouldn't normally think of.

That, or simply try to visit every single city and town in the entire world. The bus is a good way to start.