Next on my list is Australia, but for a week each Japan and London were great fun too. Now that I think about it, I'll bet in 2 weeks I could do an epic nationwide road trip
South East Asia tour.... Your money goes a long way over in the 3rd world countries. Places like Japan and Korea can get pricey though. But I would imagine you may like Vietnam, the maldives, Phuckett, and Bangkok
Road trip to visit friends in the western US. Not KA! England, Franc, Belgium would be cool, but cant carry, and Americans are not that popular with the aloha snackbar types, so that is out.
I would go back to either austrailia or Japan. If I hadn't lived in Hawaii for a few years that would be third, but I'd have to say my third choice would be Alaska.
New Zealand, Australia, and there are lots of places in Europe I would enjoy visiting for their rich history. As beautiful as South America, Africa, and parts of Asia are, they are just such hell holes for the most part.