Where in the world do you want to go?
Where it's warm, you speak the language, can travel safely and freely, and it's cheap?
Does that wrap it up simply enough?
Dr. Travelbest has many suggestions for you to visit, so take a peek at my book for the Top 18 destinations in the US and the Top 18 destinations worldwide. See if you can visit each one of them (at least the domestic US cities) in the next four years. visit: www.drmarytravelbest.com
Go for it!