I would probably try to explore different mythologies and folklore first, talk to gods party with Dionysus, fight Zeus, and stuff like that. Kind of like Kratos in God of War but less traumatic.

HP Lovecraft, but that I wouldn't do alone for obvious reasons

Mistborn

Lord of the Rings

Dune

Elden Ring

I love Fantasy and Art so in a dream World, I would probably be some sort of magician traveling and exploring, doing art and fighting a bunch of creatures and bad guys maybe talking to my favorite Artists that are already dead like Sargent and have a system in place that allows me to talk to family or let my family join my world ( same goes for close friends etc.). I would also just keep the intelligence and processing power of humans like it is now and don't have it enhanced artificially so that I can enjoy the world as I imagined it as a child.