I would take them to Wales so that they could experience how beautiful some parts of the UK are, that they could visit a red kite feeding station to see these aerial acrobats close up as well as see them soaring in the sky above my better half's isolated family cottage, along with buzzards and loads of other birds. The only place I have ever seen wild badgers (we had to stand very still and they came within feet of you - so cool). I would love the kids to see nature at its best, to learn to love and look after living things, respect the countryside and admire trees and hedgerows, see how farmers make spaces for wildlife as well as domesticated animals and their crops. I know the world is full of wonderful, exotic, hot, pretty, interesting places, and ideally I'd love them to be able to travel extensively and see a lot of them, but it would be good to start nearer home, be realistic and practical, teach them to love what is all around them, pretty much on their doorstep.