An ocean with large pockets of powerful currents that are very hard to swim against, to stay in the image. Yes, everything is qualia/sensation/thought, and I get the appeal of the concept of "OMG, by me writing this and you reading it I just literally changed your brain!". But not every state of our brain/consciousness is the same, not every state allows for the same movement of the fish.

There's a higher-level interpretation of what the term "state of consciousness" means to many people. Not a "state of the brain, like a state of a cellular automaton" but instead a section in the incredibly high-dimensional space of possible brain states that greatly facilitates going to other interesting positions, i.e. thoughts or experiences.