This leads me to emphasize that many challenging behaviors are an attempt for an individual to escape the aversive or unpleasant situation.
Many challenging behaviors (especially escape behaviors: running from situations, destructive behaviors, aggression, self-injury, or tantrums) stem from the presentation of perceived (or actual) difficult tasks (or aversive/unpleasant experiences). These escape behaviors can be intensified if an individual lacks the communication skills to express their concerns.
So.... does this mean to avoid presenting difficult or challenging tasks to children/adolescents with ASDs?
Victories and successes can encourage more victories/successes. Respect of one's likes and dislikes is important too. Therefore, prepare the individual for new experiences. Add a sense of familiarity to a new experience.
When a routine changes or one's environment is not as structured.. then it can be somewhat unpredictable for children/adolescents with an ASD.
Have you tried a simple schedule or checklist for your child? A schedule can add predictability and a sense of control for many of us. This is especially true for individuals with an ASD.
The point I am hoping to make is: summer is a great time to introduce and touch on.. new interests, leisure activities, and skills. However, make it fun. :)