Being a mother of grown kids my priority was to keep them entertained at home as much as possible and keep them off the streets looking for something to do. Have you considered upgrading the play area to things that are more age appropriate at this point in their lives? Consider a high climbing wall with foot holds and hand holds that they can climb like a mountain climber would practice on. A small weight bench with lighter weights appropriate for their age. A skate board bar to practice sliding on. A basket ball hoop. A sporting goods store might have more ideas for things that kids are into these days. I seriously doubt that they will get much enjoyment out of a fountain at this age. Outdoor speakers connected to a stereo indoors might be something they would enjoy too so they can rock out while they exercise. Good luck!