What is missing from my Runtime are probably already out there, I just have not come across them and, no, I am not asking anyone to look for them.  What I want:

Children and their props, hair, clothing, etc.  Style, time period, and apparent intellect are not all that important, but, as has been mentioned, sci-fi kids would be an example.

The track for an electric race car set.  I could scale down vehicles to play on it, but am not finding anything that looks like either a Hot Wheels track (track, loops, jumps, etc) or like the old slotted tracks I had when I was little.

Scale model terrain and structures that looks fake, but with a lot of detail.  Not a painted cotton ball, but not photo realistic, either.  And, no, not like some noob got it wrong, but like a skilled artist make it look like that on purpose.

A full scale, multi floom water slide complete with pool, surrounding sidewalk, and water spray props.  A log floom could be a part of it, but I would want people on mats or just their bottoms sliding down the thing.

Real arcade (not video arcade) games such as Ski-Ball, a shooting gallery with the rows of knock down ducks / boats / whatever.

A dunk tank complete with water sprays, little drain spigot, and an articulated target arm so I can change the camera angle and see just how hard the target was hit.

A "test your strength" sledge hammer bell ringing thingy complete with not just numbers on the board but comments as well (puny, he-man, tough guy, etc).

A damn good Haunted House exterior.  It has to look good as a full screen establishing shot as well as showing sufficient detail while standing on the porch.

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Most of these probably already exist, but these are what I want and would use before year's end.