I advise not going to Europe in the Summer. Locals leave the cities, pick pockets come into the cities and the prices go up because there are a million other tourists. If you do go to Europe, go to a Northern Country (the weather is much more comfortable) and avoid cities and the avoid the most popular tourist areas. Rome, Paris and Venice are the worst places to visit in the Summer. If you can only take a vacation in the Summer and you really want to be in Italy (because, let's be real, Italy so much more swag than Germany or England), I advice you to go where Italian domestic tourism goes. Go to the vineyards, mountain resorts and beaches that Romans, Napolese and Milanese visit.
Within the US, Las Vegas is the most overrated destination, by far. Maybe in the 1950's when it was run by the Mafia and gambling was illegal in the rest of the Country, it would have been unique and awesome. In 2015, you can satisfy all of your vices in any major city and in other cities, the bartenders know how to mix drinks other than a vodka and red bull.
Locally, us Southern California people tend to have sentimental value for Disney Land because we went there as kids but looking at it objectively, I can see why it can be underwhelming if you visit as an adult and you did not ever go there as a kid or for grad night.
