I took a wander up to Whitelees yesterday (and have the lobster complexion to prove it):
http://s89.photobucket.com/albums/k221/arsemagic/I followed the road out Eaglesham as far as the house marked 'Carrot' on the OS map, followed the marked path across the field at the back of the house, then took the forestry road up the hill, which spits you out roughly in the middle of the whole thing.
The scale of it is pretty intimidating. I certainly never fully appreciated it till I stood almost directly underneath a turbine and looked up. This photo is pretty rubbish, but it shows the access door and steps at the bottom for some idea of the scale:
The ground has been pretty badly churned up in most parts, but they have planted wads of bog cotton and other vegetation, and the bulk of the area was monocultured Forestry Commission plantation anyway. One potential problem I saw was a spontaneous fire breaking out near one of the turbines:
The bog and forests all around were tinder dry, and a spark or two could set the whole thing off at this time of year.
And the views from Corse Hill are spectacular! Looking north you can see a few Bens poking up above Dumgoyne, west see Arran and Ailsa Craig to the SW, Darvel TV transmitter is clear to the south and Ayrshire beyond. And of course the whole of the Clyde Valley spread out.
It's definitely worth a look, but as Brigit says doing it on foot or bike needs a bit of prep. The now, that means sun cream and plenty water. But I could see it being hellish up there in early spring or autumn if the weather turns.