Star Wars trip - Tunisia

[skibum]

I'm heading to Djerba, Tunisia in June with a mate and while we are there, we're keen to visit some of the key Star Wars film sites. In particular Luke's house (interior and exterior which are in two different locations), the canyons where the Jawa's took Artoo and Luke was attacked by the Sand People, Obi Wan's house, etc.. As to be expected some of them are in the middle of nowhere which makes it a bit of a trek. However, I think we can tick off the top options in an 500 mile round trip.

Questions I have are:

Has anyone visited any of the locations - is the juice worth the squeeze?
How viable is trying to cover 500 miles in one day (shared driving)?
Anyone know what the driving is like in Tunisia - any hints? Tips? Scare Stories?

Any guidance appreciated and of course... may the force be with you... always.