Lucid Time!

I was exploring this city that was mostly underwater. I can remember flying into the city, though I was not lucid. Then I walked through these causeways, entering though part of the city that was above water.
At first the causeways were kind of bland. They were two or three story rooms with concrete columns. I can remember walking past some construction workers, so I assumed that this was a new section of the city that was under construction. As I continued to walk, the hallways got more decorated with shops, like a shopping mall.
I eventually ran into this young man, and said to him in a woman's voice:
"I'm done exploring the shopping mall. Can we go now?"

Something related to the main dream. I can remember flying past a cargo port, where a crane was loading crates into a submarine. But the submarine was grey and red, like a ship, but had the shape of a missile or rocket. The cargo bay on the submarine closed. It submerged and pulled away from the port.

Something to do with me finding all of these toys by the side of the road. I can remember it being in a sunset, near a broad curve in the road. I started collecting them and putting them into a bag. Then someone pulled up in this black van and told me that the toys that I had been picking up were theirs. They thanked me and took everything that I had picked up.

I was looking out the window of an airplane as we were taking off. I think that I was laying my head on someone's lap. Not long after we got to our cursing altitude, the plane started descending. We must've crashed or something. I can remember washing up on the beach of a tropical island. I thought that I was still alive...
The words "game over" showed up written in white cursive in the middle of my field of view, as though my dreams followed video game rules.