My 3yo can take her own plate, cup and cutlery to the kitchen after dinner and often helps unset the rest of the table too, she can help collect dirty washing and take it to the laundry, she helps to make her own bed - usually by helping straighten the donar and then picking up her pillows and putting them on the bed at the end, she can help empty the dishwasher - mainly the cutlery (including butter knives but not other kinds of knives) and sort them into the cutlery drawer, wipe down the coffee table, help with dusting, sweeping and can use a dust pan. She still thinks these things are all fun so we haven't had to do treats ... yet She has to ask before she leaves the table at the end of the meal and when we say yes then she takes her plate, cup and cutlery to the sink then ...

Treats - can be anything from art/craft/cooking to outings to food treats like chocolate or strawberries (my DD thinks strawberries are a treat )

HTH