I've recently taken on the following activities as "assignments" for myself.  This is in no way an exhaustive list of possible summer activities--you won't find day trips to the pool or beach, family vacations, or cookouts with friends on this list of "summer assignments" (though those may appear on a different list of summer fun!). And these are not necessarily measurable action items that can be checked off of a to-do list upon completion. You may want to practice some of these things once (or several!) times per day, while others may be more sporadic or peppered throughout your week.