Visited in Aug 2007 with my mum in tow. Lucky to have quite a fine day and the views across the water were breathtaking.
The visitor centre is interesting; certainly from my mum's point of view she found it helpful to have some info about the landscape, geology and the history of the site. Without this, I imagine the actual arachaeology side of it would be rather dull! The huge Scots Pine which is located in the centre is also pretty stunning.
When you get out, you walk among the bog past lines of stone walls; I actually got a bit excited about it all but can appreciate why it may be beyond the interest of the casual observer!
There are the remains of a domestic enclosure which is also really interesting but overall the most spectacular thing about this site is the location. Amazing.