Thanks for all the replies, we've booked the flights, hotel etc. and I'm now in the process of mapping out a funny shaped squiggle that will be our route around as many sites in TME as we can fit in one day, probably will be the ones west of Evora. Really looking forward to it, those dolmens really float the oul boat, and the cromleques (or whatever way they spell 'em!), wow!

Thanks for all the input from Carlos especially, I may be picking your brain for a few more details over the coming weeks, we're going to be in Lisbon from the 16th to 21st I think so must try and meet for a beer, or emergency accomodation if herself kicks me out for lingering too long at some site or other :)