We were there on Day Three. There were no problems with parking at 8:30. We had heard nightmares from people on the strip that it would take hours to park and there was a four hour wait for some rides. Now, when has that ever been realistic??? On the third day, they were expecting 13,000, but came a couple of thousand short. The rides were fully open (except the Waterboggan) and fully staffed.
The Giant Swing has some improvements. In the queue, the chicken wire separating the line from the Lost River has been replaced with stronger wire - much better. Then, where the graffiti was a problem in the skinny part of the line, the upper half of the wall has been removed. Now you can see the ride area before you get on the ride, and graffiti should be less tempting. All good.
In the Flooded Mine, all the characters have had makeovers (though they look to have paper mache heads or something), and I noticed at least three guards have been added to the prisoner crew, along with new sounds. There's always a lot of stuff happening in there, so we'll have to keep looking for the new stuff. The song seemed more prominent, as well. Other upgrades have already been mentioned.
Geyser Gulch has new targets for the water cannons and at least one new pad for the kiddie fountains.
Midtown looks great and has an assorment of shops that will appeal to a more relaxed crowd. It's the first time I've seen such continuity there.
Fire-in-the-Hole seemed a little lighter during the first part. They now make you stow your loose items like the other coasters. I don't think much was done on the inside though - hard to look when you're calming a four-year-old.