So I'm sure lots of us on here have things they see in the park that they always wistfully wish they could do if it weren't against Disneyland park rules. Whether it's diving into the submarine lagoon, skateboarding around the park, riding the Tinkerbell zipline, etc.
For me I think the one thing that stands out the most is that I always wanted to do was to spend the night in the Swiss Famly Treehouse. Of course, I'd need them to turn off the polka music, but I always thought that would be so much fun.
Another thing that comes to mind is riding the Haunted Mansion alone. I'm talking about going down the elevator by yourself, walking down the hallway, and then boarding the one lone doom buggy and taking a ride through. I've always kind of hated that you can see all of the other doom buggies and even hear the narration coming from some of the ones in front of you. It takes away some of the immersiveness of the theme. Ditto for Pirates.
Even though I don't think there was ever a time that I thought that the gold and jewels were real on Pirates, I've always wanted to jump out in the treasure room scene and play with all of the fake treasure. Toss some gold coins up in the air, slide down a hill of gold and jewels, etc. Now I realize that chances are all of that stuff is glued down.
Walk through Club 33!!! Even as a cast member who knew two of the girls that worked there I was absolutely not allowed to do that.