It is a time to get dinner (especially nime chow) with friends, often.
Summer is made for quick road trips, vegan brownies and swimming holes.
Summer means barbecuing and beach trips with family.
Summer in NYC means free beaches, covered in beautiful babes sunbathing topless, kids playing in the sand nearby and those delightful frisbee throwers kicking up sand everywhere. The beach rules also include mandatory frolicking, and I am always happy to oblige.
Governor's Island is only open during the summers. You can take a free ferry over to the island. We lucked out on this trip...free ferry, free beer and scavenged ourselves some free sandwiches!