Like taking your first bite of juicy watermelon:
And nothing says "Summer Fun" like a computer mouse and a bedroom slipper. Fun indeed!

{ushering the kids out of the room...}
OKAY, I'm just gonna say it because I know half of you are already thinking it. The flop on the right looks a little... enhanced. You know, like, manly? No? Alrighty then. (Step one: open gutter. Step two: remove mind.)
Taking a family trip to the beach is always a favourite:

(Really... picture it. Walk through it. C'mon, let's do it together. The birds are bigger than the people. The fish are bigger than the people. The shells are real, and they're also bigger than the people. And the people may or may not be naked. P.S.- tilted evergreen tree. That is all.)
You could say taking your first dip in the water is when Summer truly begins.:

But be careful out there, because creating your own personal Shark Week would be a total summer bummer: