My girls don't really play either, Skadoosh will run on the wheel, Lulu doesn't. They do like to look around for food, so I just scatter treats around on & in their accessories or furnishings if you will s/a swing basket, the deep hollows of their fake branch, and wodent wheel play bin & basket that contains some fleece pieces and small plastic Easter eggs. I just put some pellets in the eggs, I'll see if they get to them by tomorrow am. They do love to eat, and they do run around all over the cage, they hangout on the floor and furnishings on the floor as well as other items hanging about at various levels and also on cage walls. Occasionally I'll see them hanging upside down, sometimes from cage top, reminds me of a bat especially when they stretch out their flaps.
When we have them out they run all over us, the chairs and really love to hangout on hanging clothes. My husband and I like to try to keep them between us, allowing them to jump from one to the other, hoping it becomes a fun game for them. Eventually I hope they will be bonded to us that we can move farther apart and really let them glide back and forth between us. We try to use as dim a light as possible.