My friend and I were driving through the region (wanting to see the Cinque Terre) and decided to stop here and see what they had to offer. With the help of an English-speaking camper, we managed to "book" a night, opting to sleep in our car "dormi in machina", since we had no tents. The "campground" is more like an RV park, where people can rent bungalows (by the year, no less) and then bring their RVs and attach them to their bungalows. A lot of camping sites in Italy are like this, or a combination RV park/campground. So, with beach mats and towels as "curtains", we managed to sleep in the car for 5 nights, for about 20 euros a night total. The owners managed to communicate with us through hand gestures and my broken french and our crappy italian phrasebook. They gave us a map and told us how to take the very inexpensive train to the Cinque Terra. (by the end of our trip, we found out on our own what they had been trying to tell us - there was a train station just a 15 minute walk away - we had been walking to the very far away one in Sestri Levante). The Riva trigoso station has limited service, so make sure you get the times right or you'll be walking a long ways like we did - a good way to burn off all that gelato.
Anyway, the campsite has clean bathrooms and showers, a delicious restaurant on the top of the hill with a fantastic view. It is also a VERY safe place, it closes it's gates to cars at night, has monitoring screens, and a very alert security guard who patrols and actually does his job.
We were very pleased with our stay here and only wish we had access to one of the bungalows instead of our car (i think they did us a favor by letting us stay - it seemed like they generally only rent out the bungalows, and i think there's a huge waiting list).