Here is a note I read on the internet, courtesy of the U.S. Consumer Product Safety Commission.
The U.S. Consumer Product Safety Commission (CPSC) advises parents to check for hot surfaces on metal playground equipment before allowing young children to play on it. Solid steel decks, slides, or steps in direct sunlight may reach temperatures high enough to cause serious contact burn injuries in a matter of seconds.
CPSC knows of incidents in which children suffered second and third degree burns to their hands, legs, and buttocks when they sat on metal stairs, decks, or slides. Young children are most at risk because, unlike older children who react quickly by pulling away their hands or by getting off a hot surface, very young children may remain in place when they contact a hot surface.
A Grandpa Richard Recommendation: I highly recommend that you print and use the following booklet about playground safety, courtesy of the U.S. Consumer Product Safety Commission. It is a 13 page PDF booklet aimed at 3 to 5 year olds. Little Big Kids. Print it and then go through it with your children before heading to the local playground.
Playground Safety Part 2