Use your brain. It's metal (or plastic). It's in the sun. It's GOING TO BE HOT!
Does it seem to you like today's kids just can't handle the things we used to do? I saw another report about a kid getting burned on a playground slide and I couldn't help but wonder why today's kids can't do the same things we did as kids without getting seriously injured? I don't know anybody who got 3rd degree burns from sliding down a hot slide. Why? Our parents taught us that stuff in the sun gets hot so be careful and check it and now parents just don't think.
What do you think? Maybe their folks are failing to teach them some common sense about playground equipment, toys, etc.?