Fill in some of the gaps in your kids’ education with a visit to Sicily where you can squeeze in a session on the Greeks, Romans and Normans, or a volcano-themed geography lesson, without so much as a mention of books or homework. Sicily’s extraordinary past and its hugely varied land and seascapes make it a fascinating island for all ages. If you have not booked anything yet, there are weeks available right up to early September at a selection of Wish Sicily villas.   Escape the crowds and head for the heartland of Sicily Head inland for peace and…