Valletta is worth a visit very old and interesting, when we were on the island a few years back, there was a thunderstorm, the roads are not built to cope with the rain and everywhere was flooded, I did drive over there and seem to recall the roads not being the best, but no worse than some of the patched up rubbish we now have to endure over here, like robjh above I too think its worth exploring the island by bike, just don't get in the way of the bird shooters,