Eng Heritage have a nice PDF of footpaths to the North of the stones plus various marker boards dotted around to illustrate the various sites and things to see...
I'm sure there was another walk PDf they produces for sites further out, but can't seem to find it online at the minute.
Don't recall there being any evidence of the Bluestone Henge dig (though that's the idea post dig, return the site to as you found it, or as best you can).
As the other poster Re:'da Blik', best left alone else it'd be trampled to hell.
Have fun if you make it, also take some warm clothes, as evening falls, it get remarkably chilly on the plain, even in early Sept when I did it.
If you fancy a linear tramp, there's a nice C4 PDf for the Tony Robinson series...
http://www.channel4.com/microsites/W/Walking-Through-History/Walking-Through-History2-Stonehenge.pdf