The road between Agrigento and Selinute was out due to the bridge collapsing near Ribera c 9 Feb 2013. We had to go back to Palermo or take a detour over secondary roads (3 hrs). Check locally while touring or planning.
Make sure you go to the effort of parking in the designated parking areas and NOT on the side of the road even if lots of people are doing it. The police monitor the area and will not miss the opportunity to give you a parking fine (all in italian small print of course). The fine I got was 30 euros but as I had no idea where to pay it, or anyone to translate for me, it turned into a 75 euro fine 7 months later when they tracked me down via the car hire agency.
I saw that sign on the fence behind small restaurant and it looked like a good joke. Sicilian people were mostly friendly and helpful and the country felt all the time safe in general. OK, you'd probably not want to leave your car parked everywhere in the night with all your belongings... after all we're dealing with large population where not everybody is good and that means use common sense but don't panic. Just like you would do somewhere else.
The bigger problem is when you're driver and you rely on signs and maps. They can be on times misleading or missing and you do get lost if you're not driving here often. Good map is very practical and they sale large Sicilian map in bookshops and petrol stations. I'd recommend buying one. We had smaller one and it had been used as rough orientation map - more you wouldn't expect from one.
Also, I had impression that they don't want you to use regional roads but to use their highways - because it took us some time to realize where to get on the road from Agrigento to Palermo. There was always only sign for Palermo highway and if you'd follow that you'll had to drive to the west of Sicily first... quite far and lot further. And highway is not for free, of course - that says it enough. So, you end up asking locals very often and even then you need to ask several people because they won't always know... often we got very different directions to get to one place.
It's still common to brun grass here. So if you see something burning in the middle of the fields, don't thing that it's a house burning or something. It's just the way to "clean the land" ( i suppose animals on that land too). At least in my country this would be illegal, but oh well, we are in Sicily here. Where there's no clear limit on what's legal and what's not.
In some houses of Sicily water shortage still appears. It's not a very common thing by now, but sometimes it does happen, espeacially in bigger many stored buildings. In that case a water must be brought to the bath down the house (for all the people) usually after that the first does of water is limited to one or two hours, but from the next day everything goes smooth. btw, talking about the beach - don't forget to take something for sipping as it's really really HOT.
Remeber that you are in Sicily, closer to equator, accordingly if you are sensitive to the Sun which is present here almost always even when all the other parts of Italy are covered with clouds, use all possibile ways of protection. I know that sun is a wonderful stuff to enjoy at the beach, but even with sun protection cremes TAKE IT EASY, otherwise you'll simply burn. This photo is not up-side-down; it's just taken while lying on the beach and looking at the sky, having leaning rocks behind ;)
Because I saw some people bringing small dogs to the temple valley, I would like to warn about the wild dogs around the Juno temple. They appeared from nowhere and sat studying our five-year-old intensely but her father is very used to dogs and did his "dog mannering move" back at them. However, do keep pets and small animals close to you as they did look like pitbull crosses and not your average Meditteranean stray dog...
One thing for sure, if you are afraid of heights, some places of sicily, roads, towns and etc. might cause you some troubles.
Take a look at the streets enlarging the picture.