This is a set of (mostly) plain parking lots. I was tearing my hair out trying to find good parking, so I just made my own.
Because of the tree/prop limit, they are not decorated, but all spots work. You can decorate them yourself ingame.

Park type asset
Fully functional and modular
0 Tourist
5 Entertainment value
100-150 Entertainment radius depending on size

Cheers and enjoy! Leave comment if you'd like some other size, but I think I got most covered. You should be able to combine to create just about any shape.