Paris, France
Paris is a city full of wonderful things! Although sometimes hot and humid (especially in August), this well-known location is one of the best places to travel in Europe in the summer. Costs for items like hotels, flights, and tourist attractions will likely go up, but since you'll be able to avoid sweater weather while you go, the extra costs will be more than rewarded.
In fact, with highs in the upper 70s, the weather between June and August is nearly parfait (also known as ideal). Summertime in Paris offers a variety of pleasurable activities, such as sunbathing on the beach, watching outdoor movies, dancing at outdoor concerts, and watching bikers come into town during the Tour de France, in addition to dining en plein air (also known as alfresco). By exploring the Cathédrale Notre-Dame de Paris or a few of Paris' greatest museums, you can escape the sun (or the rainy July days). You really must say, "Mais oui, Paris", to summer vacation when there are so many enjoyable things to do in Paris.