Basic:

1. Walk through an Art gallery and examine the artwork created by your mind. (Tiktaalik)
2. Explore the Great Barrier Reef. What do you see? (Moonagedaydream)

Advanced:

1. Walk on stage not knowing what it is for. It could be a show, concert, award ceremony or something else. See what happens and improvise. (Tiktaalik)
2. Be part of a video game, either an existing one or a new one imagined by you. (GabiAlex)

Bonus:

Discover who you are really are in a lucid. Who is really aware? What is the difference between yourself in a non-lucid, lucid dream and the real world? Are you really who you think you are? (Humbledreamer)