Would love ALL of that! I love "activity" type of objects, but we all know TS4 is very stingy when it comes to adding new animations.
Of what you've mentioned, I could maybe see the following being added (using existing or slightly modified animations)
- Tire Swing = Definitely could see that since there's already swings in the game, Only thing is they'd need to animate climbing into the tire, unless the sim just magically floated into it
- Porch Swing = Nothing more than animating the swing to go back and forth, since the sitting animation is already in the game for 2 person loveseats
- Playground Equipment = Could definitely see normal, regular slides being added since there's already a sliding animation, would just need to move the routing from the side to the back of the slide
- Lemonade Stands = Could definitely see this added since there's already "food stalls" in the game, would just need to be adjusted to kid height
- Trampolines = Maybe if it was simple jump up and down without flips, since we have a jumping/play in puddles animation
- Corn hole = Definitely could see that being added since there's already an animation for Horseshoes, which is essentially the same animation
- Four Wheelers = Maybe, since we already have the jet ski animation, would probably just need some slight adjustments
The rest (at least to me) seems like they would all require new animations