COMPLETE contrast... After a while with our last hamster, I actually didn't change up the cage often because he had only 2 or 3 things he liked and he had no interest in new things and no interest in chewing anything other than food and Whimzees. He did enjoy flax sprays and a variety of foods, but he would just hoard them and then stay in his hidey hole until we went to sleep and then come out to use his wheel most of the time.
Oaky comes out anytime she wants, and if she's in the mood and she sees us she'll keep stretching and reaching, like you're gonna help me get out of here, right? She makes lots of burrows and tunnels, chews at fabric during free roam time, chews at cork and Palm leaf bowls in her enclosure- basically tons of things.
When we first got her, she was very anxious about hands or being held and would sometimes be very jumpy, and do like a 180° turn if she got nervous about a hand being near her or about being picked up.. Now she crawls right into my hand and patiently hangs out, mostly because she understands that I'm her ticket out of that enclosure. But she is, so i'm bold that I have to be very careful. Yesterday, I was transporting her in an upside down, igloo and looked away for a brief second and she jumped right out, and I was so worried because I was standing up, but luckily she was okay, and now I know in the future to watch more closely. She will launch herself, though. She has no fear.