Create some sun finger puppets to celebrate? These were for the last day of third grade...
Check out this darling felt solstice craft idea from Twig and Toadstool
What kid wouldn't have fun with a summer solstice wand via the tutorial at Natural Kids?
For the sweeter treat, taste of home has a cute sun cupcake idea...
I would have a harder time passing up Becky Charm's Lemony Lemon Brownies though!
And don't forget a story or two! Sunbread, by Elisa Kleven, is sweetly illustrated and comes with a real recipe at the end:
We liked this one, found at our library, about a Cranky Sun that refuses to go down until a boy has a kind conversation with him.