I'd love to go to one of the poles, vast expanses of white, always thought it might be like being on another planet.
Also fancy the trans-Siberian express with a good book, ending up somewhere mad like Mongolia.
Got a thing for waterfalls as well. Seen Niagara and Victoria. Need to see Angel and Iguazu.
Oh, and Yellowstone NP, I'll make it there one day.
Sorry, i haven't got any like eating such n such in some restaurant or staying at a particular famous hotel. Stuff like that has never really grabbed me. But natural wonders or interesting wildlife...could easily fill a bucket or two with places like that. My best ever holiday was hiking and camping in the Okavango Delta. Don't generally have the urge to go back to places, but I'd make an exception for there. That's one that i wouldn't tick off the list no matter how many times i went back.