Secondly delegate to (probably) Jack Straw, possibly Miliband over a long summer holiday.
Ideally he should rent a cottage in Devon for the first part of the holiday and be seen going for lots of country walks, a couple of shots of chatting with locals but no politicking.
Then aborad where there are no voters to interact with and (hopefully) no media apart from a few syndicated photos and clips of him reading something slightly trashy (if he's seen reading an economics text book that's not good).
Where? Can't be the US or he'll get caught up in the US elections. Can't be in the EU or he'll end up talking about the Lisbon Treaty.
So preferably somewhere he can completly unwind and be photographed wearing slacks and short sleave shirts.
No where immediately springs to mind but I wonder if Cliff Richards still has that yacht in the Bahamas.