Turn back the clock? I would go so very far back. I'd go back to the mid 90's when they still had the double decker buses in the WS, and then the Junkanoo bus (wicked talented people there!). Back to a time when the FWF was a true festival and featured the better restaurants of WDW on a rotating basis, and there were many cooking demonstrations right in the WS (saw any number of headline chefs during those days). Back to a time when WDW was sparkling clean and any CM could answer your question about location of an attraction or other question along those lines...back to the days where WDW took real pride in the training they provided...when I saw a suit call for a clean up team minutes after a box of popcorn had been spilled.
You remember, yes? Those days of real magic and not just money grubbing?
I often think whistfully of those times. Back then all the CMs also seemed to truly love their jobs, and they were so fun to talk to, and the bus drivers nearly all had something fun to say on the rides to whereever, and the bathrooms were clean, magic happened all the time and it never felt forced or "bought" and, and , and. . .Oh I DO miss it
As far as specific things, there are lots but I will try to limit myself:
I would go back to when The Wonders of Life Pavillion was open and enjoy seeing Cranium Command again.
At the same time I would hop over to AK and see Tarzan Rocks (loved that show--still can't give Nemo a fair shake because I sit there seething that Tarzan is gone

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Then I could head back to the mid nineties and enjoy Pleasure Island when it was a fun party every nigth with live entrtainment on the outdoor stage and fireworks and the Comdey CLub and Adveturer's Club could enetertain me all night long (and I could enjoy the outdoor entertainment while I watied to get into one or the other).
I would go further back (and I would LOVE to be able to take my kids back in time to these days) and see the original Journey into Imagination with many of you, and also see Captain EO (what that the 2nd or 3rd 3-D movie?--whichever it was I loved it, and I have a young Michael Jackson fan who would adore it I am sure

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Oh, and I want to walk into Hollywood Studios once more and see the Theatre at the end of the street and feel like I am in something resembling Hollywood instead of seeing a big hat.