Europe would be far more fun than the Highlands, which is a good ten degrees colder than Englandshire and usually wet. Europe just gets warmer the further inland and south you go.
I'd suggest a run to Speyer and Sinsheim in SW Germany. Look up the "Auto & Technik Museum", which has two sites there. Both are fantastic. They'd possibly arrange photoshoots and stuff for a club run given a bit of notice - they like that kind of thing.
You can get a ferry from Dover for under £50 return if you wait for a deal to turn up (currently £19 each way on DFDS, I think). At regular prices, I got a return trip for around £70 a couple of weeks ago. You can get a Travelodge room on the M2 near Gillingham for £20, again booked in advance, to stay over night and get an early ferry.
Get to Dunkirk/Calais in the morning, then head for somewhere like Ypres or Lille for a look, then down to Luxembourg to camp overnight. Kockelscheuer campsite is on the edge of Lux City, and an excellent cheap site. Luxembourg city is nice enough, and plenty places to eat there. A great playground, too. Ensure tank is as empty as possible before getting to Lux - petrol is far cheaper there than surrounding countries. Fags are also much cheapness.
From there, you can head down through a bit of France then across to Germany, aiming for the Stuttgart road. Sinsheim and Speyer Museums need a day each, but they're only about 20km or so apart. Again, there are campsites in the area (though they take a bit of finding, except the naturist one).
Along the road a bit, Ulm has the highest cathedral spire in Europe. A fellow needs a good head for heights at the top of there. The missus is a climber so loved it, but I nearly jobby myself - you end up at the top in a little room that can just about squeeze two people in. Not going back.
Alternatively, it's not much further to the north side of the Alps (just the length of Switzerland!). Furka and Nufenen Passes, or St Gotthard, or St Bernard. All great fun - I'd recommend Furka, stopping at the Rhone Glacier to catch some rays and walk through the ice tunnel.
And then it's not much further to the Turin, Milan, Verona motorway. and while you're there, might as well pop down to Pisa and Florence ...
Perhaps Drumnadrochit would be easier, right enough.
