Each day leading up to Summer Break, they have the opportunity to earn a letter and the special activity that is written on the back. Every morning they start with four suns on the board. Depending on how they behave, they can either lose or earn suns. At the end of the day, if they have all four suns, they will earn their letter. Of course you can modify this in order to meet the needs of your class. I've done variations of this behavior management activity, and when I have a really difficult class, they only need to have one sun left on the board to earn their reward. Whatever works for you!
I made the pennants so you are able to print them back to back. If you want to use your own activities, you can write them on the back or stick on a label!