Ok so planning this in abit of further detail.
Possible route
http://goo.gl/maps/QMMRo
Option 1
This starts at Moretonhampstead, goes down to some reservoirs nearby, then across Dartmoor (stopping along the way for pics, perhaps some nice motion ones nearby the bit that is like Au Rouge type sweeping bit - mcgherkin i hope you get what I'm on about). Then along towards Cadover Bridge, for pics if wanted, then into Plymouth for a bit to eat. The China House, has parking (free) and is the same chain as the Barn Owl, but any other places are welcome. Then up to the karting place, before heading back across dartmoor again if people want.
Option 2
Start at Exeter - at the harvester (for food), pick up the same route, but without the stop in Plymouth, then karting if people want. Home from there.
Option 3
Reverse of the above, meet and eat in plymouth, followed by karting, then a drive across dartmoor.
There is plenty of scope for change, if you know of any better driving roads or routes, or some that appear on google maps and are not passible then feel free to change.
I wasnt sure what the roads down near Ashuburton / Poundsgate were like so they have not been included, but it can be changed.
My only issue, with fixing an evening time, is that we put all the risk in the weather. If it was more afternoonish, I am sure we can find ways to kill some time for those that would want to be around longer for some sunset pics.
It it will be hard to pull in anyone from the far east of Devon area, but a few of the non-regulars from Cornwall might be willing as its a bit closer to home than usual.
I know, but making the effort in the hope that some may have an interest and want to come.
Part of the reason for short notice admittedly as its the last weekend I'm defiantly down here with the car, and well one last hurrah is needed haha.
If Dartmoor is not wanted, or more driving or something bigger, then a mamouth drive - Dartmoor, Exmoor, Cheddar Gorge (if thats the place) Which would cover a large portion of the area, but that would require a full day, more planning and getting a day/date people can work with.