Mine all like different things. BB loves a fresh, clean fleece to lay on, she won't get off a freshly washed one for a good hour after I give it to her.
Cocoa likes her treat bowl, she will move it for me at cage cleaning time and, to clean it, I wipe it out while in her cage. She gets a bit crazy if she can't see that bowl.
Pizza has to have her hay in her sleeping cubby and, delight in putting fresh in there (acts like a doe getting ready to kindle with her haystache routine.
Tips comes running for fresh chickweed or clover.
Racetrack loves time in the exercise pen to just run in circles.
MC will go nuts for leaf lettuce and spinach.
Skittles likes to play with the water nibbler and can make it squirt fairly well - messy but her has fun doing it so, I let him. (he had a plastic bottom cage with absorbent pads for that reason.)
Cotton likes strawberries.
Sylver loves fresh alfalfa.
Tubby just wants to be petted non stop.
Cali likes apple wood stick, hoard them in the back of her sleeping cubby.
Sassy loves blackberries.
M&M loves food period, anything edible gets her undivided attention.