Obey the rules
No camping, no dogs, no fires or fireworks, no glass bottles, no large bags, and no climbing onto the stones. Pack out your trash.
Dress for success
Wear warm layers or bring some friends to snuggle with.
Make it a twofer
Move on from Stonehenge to the Glastonbury Music Festival that happens nearby almost immediately after the solstice.
Can't make it in the summer?
For those who like smaller crowds and can't make it in the summer, consider the winter solstice on December 21 (or the spring or fall equinoxes, the only other times special access is available).