You might get a bunch (or a little) of coins all at once, or it might instead shell out a few coins at a time every few minutes all day -- the idea was that if you got a slow machine and stuck with it for a while you would get more money than if you hopped from machine to machine and concentrated on the quick fix, so this was some sort of attempt to reward patience.
What happened instead was that some people (not people I knew from Earth) jumped from machine to machine, then pushed aside the people who were waiting at their slot machines and took their money, then started fighting among themselves over the money they had acquired.
Since there didn't seem to be anything to buy around there it all seemed kind of pointless, so we left them to it.
We swam across a cove to a castle where I was mistaken for someone important who, I think, was supposed to be dead, and so we were taken in and instantly got enmeshed in castle politics. I don't remember a lot of details about this, but at some point there was a murder, and everyone started suspecting everyone else. At some point I did something that resulted in everyone distrusting me -- they didn't think I was the killer (although maybe they weren't sure either way) but they were kind of disgusted with me and didn't want to be around me any more. (I don't remember what I did, but I think it was something innocent, or maybe slightly jerky but you know not that bad, which events conspired to build into apparent assholery of stupendous dimensions.) So the rest of the dream was me going around this weird, unfamiliar castle trying to talk to my friends and having them all snub me. Then I woke up.