A lot of people do swimsuit cosplays at the water park. A lot of times these are pretty simple, just a swimsuit and a wig. Sometimes people may have a few accessories, etc.
Plenty of people do non swimsuit cosplays too, but you won't see a whole lot of extremely high end, hundreds or hours of crafting type cosplays there.
It's usually a good, chill time. I'm not sure how much fun it will actually be this year though, with their overbearing restrictions that don't allow for much of anything but sitting quietly and drinking in your room.
Maybe Colossalcon will start dropping some of those restrictions before the con, especially considering that tickets aren't selling very fast.
I'd love to see that happen just to see the meltdown that the cancel culture crowd has.