From memory (so, possibly a few missing):
Chun Quoit
Glimpse of Lanyon Quoit
Boscawen Un
Boleigh Fogou
Long Meg
Stenness complex
Callanish
East Aquhorthies (sp?)
Various Dunnydeerish Aberdeenshire circles
Avebury

As 4W says, about an hour long. :^)

love

Moth