I wish I could move Miami Beach next to Boston, MA. I could watch the Red Sox and Celtics play, but still enjoy the beach!

Here are my other choices:

Either San Diego, California or Byron Bay, Australia next to New York City

Portland, Oregon next to Gold Coast, Australia

...I would say other cities, but those are the only ones I've visited. I want to visit Barcelona, London, Paris, Rome, etc...and I'm sure 2 of those would be amazing to move right next to each other - or better yet one of those next to my hometown! Sighhh...someday...