Eiffel Tower: I'm sorry to burst bubbles, but the best part of the Eiffel Tower is the outside. If you take a sightseeing or boat tour, you will see it. Going up inside of it takes a lot of time, even with a pass and is a little underwhelming. That being said, if it is your dream to go to the top of the Eiffel Tower, do not leave Paris without doing it. I like to hit up a grocery store and take a little cheese and wine picnic in the park right in from of it. At night it sparkles with lights every 15 minutes! Just be aware that several salesmen will be walking around trying to sell you souvenirs and champagne in this park. Go during the day to minimize this.