When I was around 5 or 6, I asked for fake birds and servos and ended up with a rather pathetic Tiki Room. This was followed by poking holes in the air tube in my fish tank so I could recreate the submarine dive. My parents even bought me a cardboard submarine and I could hit a switch which made the bubbles and turned on a red light. "Dive dive!". Still, it wasn't exactly like Disneyland. I modified my train set to take my sister's Barbie dolls through Nature's Wonderland, but that was no fun because the train was too small for me to ride in. My next and most sucessful attempt was changing my closet into a Mission to Mars. It's amazing what you can do with an offset motor from an old pool pump. Even adults liked that one becaues they could get vibrated.
I'm sure other people have stories at attempts to turn their homes (or closets) into Disney attractions.