My daughter and I are traveling to Scandinavia in July. Normally I don't like to travel in the summer, but I don't mind this. For one thing, from what everyone has said, it will not be as crowded as the rest of Europe. Also, you have the advantage of long days with light, so you can see and do more during that time, and it's cooler there. In fact, it can even be cold depending on where you are.
We are traveling to Iceland for seven nights, then Sweden for three nights, and then Norway for 11 nights. The scenery looks incredible, and I can't wait to go. I would definitely suggest you take a look at any of those countries in Scandinavia, including Denmark and Finland.
How long do you have to travel?