It's a fun question, but the answers probably aren't going to help you narrow down your choices; in fact, I suspect the myriad of different answers will only serve to throw MORE choices into the mix for you. Everyone has such different ideas of their "dream" places to go--some (me) love the tropical isles, some would rather head to Alaska or Iceland, some love the city and its light, some the wilderness...and on and on. Only YOU know what you love--pick three or four places you'd like to see and then just choose one.
For me, my bucket list is filled with places I'd love to see: Ireland (the home of my ancestors, from not that far back); almost ANYWHERE tropical, the Galapagos Islands, the Azores, Panama (my grandfather lived and worked in the Azores and in Panama for years in the 40s and 50s and I'd love to revisit some of the photos he took), Israel and the Holy Land (but I really detest getting shot at or blown up...), Belize, Australia.... once I've visited those places, I'll probably have added more.