Hi Juamie
I won't attempt to add to the list of places in the west of the county...there are far too many for you to see in a week. Boliegh is a great place to base yourself but pretty basic...and its a long walk to the pub!
Treveddra above Sennen Cove is a great site which we try to use in the summer if we can get in...or Bone valley just north of Penzance. http://www.cornwall-online.co.uk/trevedra/
As Ocifant mentioned I might be able to meet you on Bodmin Moor...contact me by email...see my profile.
The Hurlers and the Minions area in general should be your first priority in the east of the county. ..the Trippet Stones are just off the A30 as you cross the moor...King Arthur's Hall is surrounded in mystery and sits in a stunning location....the Men Gurta has to be my favourite stone in cornwall.
http://www.themodernantiquarian.com/site/640/men_gurta.html#
take my advice...get down here...see what the weathers doing..and just soak up the atmosphere...don't try and do too much..better to spend time at one site and enjoy it than rush around trying to see everything in a day...leave that to the yanks!
Mr H