I have so many. I had the pleasure of going to my all-time #1 dream destination already (Iceland).
First on my list at this point is probably Tanzania. I would love nothing more than to go on a safari in the Serengeti.
I'd also love to go to Morocco and Egypt. Hong Kong and the Galápagos Islands are up there for me, too.
And I'd of course love to go back to Iceland, my original #1!
Too many amazing places and things to see in this world. :)