Here's my list:
Yucatan Peninsula, Mexico
Rhein Valley, Switzerland
Prince Edward Island, Canada
Breidafjord, Iceland
I've got the same reason for visiting all four of these places: because they're locations that feature in some of my favourite books. That's definitely a good enough reason for me!
Also would like to visit a small village in France - because I speak French and it'd be interesting to see how I could get by; the Cocos Islands - because I found their history really interesting, plus what's not to love about a tropical island that hasn't been strangled by the tourist industry?; and Lithuania, because that's where my mother's family comes from.