Yes, they had water slides in Redwood City.Little by little, the animals seem to be disappearing. That may or may not be related to the hoard of animal rights protesters that are in front of the park every time we visit.
The "temporary carnival" problem comes from the fact that rides were slapped over the former front parking lot. I mean, you can STILL see the striping on the pavement in some areas! Also, since they chose to add to that area, they effectively blocked off their "front door" to guests. Now you have to walk all the way from the former overflow parking lot at the back of the property, and around a weird corner just to get to the front of the park.
There is SO MUCH potential in this location with the lagoon, but there is just no one (apparently) willing to think creatively as they develop it.
Having said all that.... we still have fun when we go.
Finally, I'll add that as a passholder, it's weird that I'm learning about their re-opening plans from a Disney fan forum. I've received ZERO communication from Six Flags since the pandemic began.
P.S. Redwood City location: didn't they have water slides??? Or am I confusing my childhood memories?
I'm a member and got emails from the park about their reopening. They open tomorrow (7/2) for pass holders, and I believe on the 4th to the general public. My kids will be out of town till the 4th, but may take them on Sunday just to go walk around. They enjoy the animals, but they are slowly disappearing as you mentioned.
And yes, the entrance is a mess. I've thought for a longtime they need to make the entrance right when you pass the lake.