The reference guide does specifically mention that playgrounds are one of the non-roof areas that should receive shading, though after the one line where playgrounds are mentioned in parentheses, they don't show up again in the credit language.

I am wondering for my project if the rubber playground surfacing we use, which does have some porosity (though less than 50%) to it and is not a traditional paving material like concrete or asphalt, has to meet the same solar reflectance requirements of other paved surface areas. If anyone has experience please share.