Boost backyard fun with accessories that take your swing set to the next level. Here are top add-ons for hours of imaginative and safe outdoor play.

FDR Park's new playground promises treehouses, slides and a colossal "megaswing" that seats 20. The Anna C. Verna Playground, a 2.15-acre space located near the Pattison Lagoon, is slated to open ...