Where should I go this summer?
It depends, for many people, a summer destination is all about going to a nice beach, enjoying the sunshine and relaxing. For others summer vacation is about going on a new adventure to explore a nice country, city or a cool nearby village. 
Here are some ideas for a summer vacation if you are interested in traveling to Europe
Road trip across the Amalfi coast for one week. 
Cruising around the Croatian islands. 
Ancient history tour in Rome, Vatican City & Athens.
Enjoy the beautiful beaches in Southern France. 
There are many other beautiful places to visit but this will depend on your budget, duration and your interests.