"I went to Plitvice Lakes National Park in Croatia expecting a tourist-filled nightmare, but it was so worth it. Sure, there were other travelers and it was busy in some places, but there were also areas where you couldn't spot a single other person. The color of the water was unreal, and the views over the lakes were stunning. Definitely make the trip here if you're in Croatia."
There simply are no photos that do it justice. It's equally beautiful and scary.
Ahhh, then you want to visit Southeast Alaska. Small towns trapped on islands with history out the wazoo, totem poles, wild animals, dense forests and amazing trails everywhere. Fishing in spring and cheap cruise tickets in fall. Something for everyone from child to child at heart. I live there and I'm still amazed everyday.
For my Part i can definately recommend going to the Grand Canyon (north or South rim).
Versailles is kind of nice but overcrowded. The Garden of the Chateau is the Highlight.
Don't go on the Eiffeltower. Go to the Montparnasse Tower. there you also have a view over the City together with the Eiffeltower. Or just go to Montmartre, there you'll have good view too. Though it is crowded and you cannot see the Eiffeltower very well