I'd like to go back to the Mid-Atlantic states within the next couple of years. I went there twice back in 2011, and I may want to move down there someday. I like it down there.
I'd also like to see, for the first time, the Rocky Mountains, the desert in Arizona, and Mount Rushmore in South Dakota.
How about you? Where would like to to travel to at some point in your life?
If you haven't seen much of the US, then definitely see the US first. And yes, Maui is the best, as Joolz has noted. But in my book, the Bay State runs a very close second (really, really close), and it's the place I'll always call home.
However, if your travel budget allows, consider visiting other countries. If your budget is small, start with Canada and see Nova Scotia. Then hop on over to Montreal; it has the vibe of a European city.
If that suits you, then add some visits to Europe to your itinerary. I've been to several European countries (the UK, France, Italy, Belgium, Switzerland, the Netherlands) - I have fond memories of all those places.
I've been to South America and Australia (I currently live in Australia), and several islands in the Pacific besides Hawaii.
The US is a great country, but there are other great countries, too, and other storied cultures. You may, like me, end up seeing the flaws of the US more clearly, but it's possible you'll come to appreciate the virtues of the US even more.
And to answer the question posed in the title of your thread - right now, my answer is New Zealand. It's nearby, and a travel bubble just opened between Australia and New Zealand. It's getting on toward Southern Hemisphere winter now, but in about six months both the weather and my schedule will be in synch and I should be able to get over there.