I always liked granny smith apples and peanut butter. Apples are great for you, and there are lower calories peanut butters out there. Could be a cool treat on a hot day. Another thing might be to walk in a pool if you have access. The water might be a little cooler than the air, it's lower impact than walking on pavement, plus the resistance of the water is an added challenge to help burn more calories.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf