The Italian coastline is not known for its wild side and it's easy to enjoy a quiet family holiday. It's true that tourists who have been there say it's better for blonde girls not to go on holiday alone. It's not that there is any danger for them, but the annoying attention of local men is guaranteed.
One more thing, young tourists should be careful when shaking hands with Italians. In their opinion, if a girl does not avert her hands when she touches him, it means a mutual sympathy. So beware - a friendly handshake is not considered to be polite.
It is also worth being vigilant on the roads as Italian drivers are notoriously reckless. In principle the locals are incredibly friendly and hospitable, so you shouldn't have any trouble.