May I recommend (at the risk of it getting even busier than I'm sure it's going to be) ....
Callanish.
Designed for the purpose.
Got to be done.
It's in my diary already.
Just need to buy my camper van and the ferry tickets!
Sals
Having watched the summer solstice sun set on my own this year, I think there is something to be said for finding a nice quiet site. One of the scotish recumbents maybe. I might save Callanish for a slightly less busy time.