Bananas. Both of my boys love bananas, and Sebastian also loves peanut butter; when I put it on a spoon, he tries to take the spoon with him, which is hysterical since it's about as big as he is. Simon, not as much, but he'll eat it. They also love frozen fruit. When Sebastian had a cut on his nose, I gave him some frozen strawberry in hopes the cold would spread to it, and he loved them. They also love yogurt. I put some on my finger and they lick it off.
As for toys, neither of my boys are fond of the ball I have, but they enjoy hammocks and tunnels quite a bit. They're kind of snobby when it comes to toys. They prefer running around and sneaking into holes much more. My bed is their favorite place to play. When Sebastian escaped his cage, I found him under my bed, completely relaxed. Which is more than I can say for myself. I have three dogs and two cats so I was terrified haha.