Plan your mini-retirements.
Don’t try to visit all of Europe in two weeks. Instead, plan a long vacation, a so-called mini-retirement. Trying to visit everything in two weeks is like taking a starving dog to an all-you-can-eat buffet. He will eat himself to death.
This kind of lifestyle ensures that you are able to enjoy your life throughout your whole life, rather than waiting until you are old—and possibly too old to actually enjoy things to their fullest, as you may be unable physically to do things that you could do when you were younger. As a result of enjoying life more, you will be much more productive with your time and less likely to burn out, as you are having long breaks to rest and recuperate and come back to work energized!