If you're planning a circus birthday party, I've left an affiliate link below for the nostalgic wooden play set you see in this post. (confettiandbliss.com)
True playground story: we were at the local elementary school playground, as part of an after school program, and the kids are playing on the big wooden play structure. (crappypictures.com)
This gorgeous wooden play house is perfect for nurturing this whilst developing their fine motor skills. (wetheparents.org)