Hi there Paul, personally i would give Tintagel a miss. It's not the best advert for cornwall with wall to wall chip papers and cafes. Its a bit like Newquay for the non-drunks! But as I worked for the National Trusy for Devon & Cornwall I would say that. You must go to the Eden project if you want kids imaginations to really run wild ... I mean a real live tropical rain forest wow! Then there is the far west ... Penwith with all its archeaology and history. have a trip DOWN and old tim mine too ...Good luck.